I have cut and pasted the 'extensive list' for you.  I hope it solves your problem!  I didn't need to do every procedure as the connection was found after I have uninstalled all the network adapters.  Good luck.

I have reviewed the results provided by you and understand that
there are no changes made to the system.

After reviewing your information, I have come up with the following
steps to find a resolution to this problem. Please do note that
every step has significance in arriving at a satisfactory resolution,
therefore please provide the result of every step.

Check the wireless connection status. - Microsoft Windows XP
To check the wireless connection status in Microsoft® Windows®
XP, perform the following steps:
1. Click Start, Settings, and then Control Panel.
The Control Panel window appears.
2. Double-click Network Connections.
The Network Connections window appears.
3. Double-click the Wireless Network Connection.
4. The Status should show Connected.


Determine if the network adapter is visible in Microsoft® Windows®
2000 or XP Device Manager.
To check the Device Manager for the network adapter, perform
the following steps:
1. Right-click My Computer.
2. Left-click Manage.
The Computer Management window appears.
3. Click Device Manager from the list in the left pane.
The device tree appears.
4. Click the Network Adapters category tree.
The network adapter appears in the tree.
 
NOTE: If the network adapter is not listed in the Network Adapters
tree, click the Other Devices category tree. The network device
may appear as PCI Ethernet Adapter, indicating that the driver
is not loaded. A yellow exclamation mark (!) or a red (X) beside
the network adapter entry indicates a problem with the device
or the driver.



Configure the wireless adapter to associate to the base station
in Microsoft® Windows® XP.
1. Click the Start button, and then click Control Panel.
2. Double-click Network Connections.
3. Right-click the Wireless Network Connection, and then left-
click Properties.
4. Click the Wireless Networks tab.
5. Highlight each item listed under Preferred Networks and click
Remove.
6. Click Add.
7. In the Network name (SSID), type wireless.
 
NOTE: The SSID is case sensitive and should be lowercase.
8. Uncheck Data encryption (WEP enabled).
9. Make sure This is a computer-to-computer (ad hoc) network;
wireless access points are not used is not checked.
10. Make sure all other boxes are unchecked.
11. Click OK.


Place the wireless system next to the wireless base station.
Move the wireless system very close to the wireless base station,
router, access point, or residential gateway.



Turn off or disable all devices that may be causing interference.
Devices that you can turn off that may be causing interference
include, but are not limited to the following:
? Long range cordless phones
? Wireless cameras
? Wireless baby monitors
? Microwave ovens
? Wireless speakers
The following devices may also cause interfere but you will not
likely be able to disable them:
? Most wireless medical monitoring systems
? Elevator motors
? Medical MRI imaging devices
? Air treatment static precipitators (filters)
? Welding equipment
? Power lines
? Electric railroad\tram tracks
? Power stations
? Fluorescent light ballasts



Enable Long Preamble on the Wireless Router/Access Point/Base
Station.
Set the Preamble or Header Length on the Wireless Router/Access
Point/Base Station to Long.
 
NOTE: For detailed instructions on this procedure, please consult
the Online Users Guide. 
NOTE: If you do not have access to the Wireless Router/Access
Point/Base Station, please contact your IT department or Network
Administrator to obtain the proper settings.



Uninstall Truemobile 1150 Client Manager.
To uninstall the Client Manager follow these steps:
1. Click the Start button, point to Settings, and then click
the Control Panel.
2. Double-click the Add/Remove Programs icon.
3. Click the TrueMobile 1150 Client Manager.
4. Click the Change/Remove button.
5. Click the Remove button.
6. Click Next.
The Confirm File Deletion window will appear.
7. Click OK.




Uninstall all network devices from Safe Mode.
To uninstall all network devices from Safe Mode, perform the
following steps:
1. Boot the system to Safe Mode.
 
NOTE: For more information about booting to safe mode, refer
to Dell Knowledge Base Article: "How do I start my computer in
Safe Mode?". 2. Click Start, point to Settings, and then click
Control Panel.
The Control Panel window appears.
 
NOTE: In Microsoft® Windows® XP, Settings may not be displayed
in the Start Menu. Skip to step 3.
3. Double-click the System icon.
4. Click the Device Manager tab. The Device Manager appears.
 
NOTE: In Microsoft® Windows® XP and 2000, click the Hardware
tab and then click the Device Manager button.
4. Locate the Network Adapters entry in Device Manager, and click
the (+) sign.
5. Right-click each item in Network Adapters and click Uninstall.
 
NOTE: Some devices may fail to uninstall. This is normal for
some drivers, so just remove each item that can be uninstalled
without error.





Download and install the latest wireless device driver.
To download and install the latest wireless device driver, perform
the following steps:
 
NOTE: The following steps provide instructions to update device
drivers for Dell provided wireless adapters. Refer to the manufacturers
website or support services for Driver updates to third party
wireless adapters.
1. Browse to Support.Dell.Com.
2. Click Select a System on the left-hand side of the screen.
The Product Selection page appears.
3. Under Service Tag, input your system service tag, and then
click Go.
4. Click the Downloads tab at the top of the page.
5. Under Select Your Download Category, choose Network Drivers.
6. Under Select an Operating System, choose your operating system.
7. Under Select the Operating System Language, select the appropriate
language from the drop down box, and then click Go.
8. Select the driver for the correct Dell TrueMobile device on
the list of network drivers.
9. Select the same device driver again.
10. Select the latest version from the list, choose Download
Now Using HTTP, and then click I agree to continue.
The File Download menu appears.
11. Click Open. The Update Prompt appears.
12. Click Continue.
13. Click OK, and then click Yes at the Update Prompt.
The file begins extracting.
14. Click the OK button.
15. Follow the onscreen instructions to complete the driver installation.
 
NOTE: If you are using a Dell TrueMobile 1150, repeat the steps
above to download and install the Client Manager Utility. The
Client Manager Utility link appears below the driver link, which
is found on step 8.



Configure the wireless adapter to associate to the base station
in Microsoft® Windows® XP.
1. Click the Start button, and then click Control Panel.
2. Double-click Network Connections.
3. Right-click the Wireless Network Connection, and then left-
click Properties.
4. Click the Wireless Networks tab.
5. Highlight each item listed under Preferred Networks and click
Remove.
6. Click Add.
7. In the Network name (SSID), type wireless.
 
NOTE: The SSID is case sensitive and should be lowercase.
8. Uncheck Data encryption (WEP enabled).
9. Make sure This is a computer-to-computer (ad hoc) network;
wireless access points are not used is not checked.
10. Make sure all other boxes are unchecked.
11. Click OK.



Install the Microsoft® Windows® XP Wireless Update Rollup Package.
 
NOTE: Microsoft Windows XP Service Pack 2 may be downloaded
and installed as it contains the Wireless Update Rollup Package.
For more information on downloading Microsoft Windows Service
Pack 2, refer to Microsoft Knowledge Base Article: 322389 - "How
to obtain the latest Windows XP Service Pack." To install the
Windows XP Wireless Update Rollup Package, perform the steps
below:
1. Click Start and then click Run.
The Run window appears.
2. Browse to Microsoft Knowledge Base article, 826942 - "Wireless
Update Rollup Package for Windows XP is Available" at http:
//support.microsoft.com.
3. Click Download the WindowsXP-KB826942-x86-enu.exe package
now.
4. Follow the on-screen instructions to complete the installation.
 


Reset the BIOS defaults on the Dell? portable system.
To restore setup defaults, perform the following steps:
1. Restart your computer.
2. At the first text on the screen, or the Dell logo, press the
key every three seconds until the message Entering Setup
appears.
3. When the System Setup screen appears, press the +
keys simultaneously to load the factory defaults.
There will be no real visual indication that the defaults were
loaded, so you may want to press the key sequence a few times
to be sure.
4. Press the key to save changes.
5. Proceed with the installation or troubleshooting that you
were attempting.
 

Reseat the mini-PCI card.
 
CAUTION:  Before you perform any of the following steps, read
the Precautionary Measures warning (located on the Resources
tab) for your personal safety and to prevent damage to the computer
system from electrostatic discharge.
To reseat the mini-PCI card, perform the following steps:
1. Locate the smaller of the two removable panels on the bottom
of the computer.
2. Use a small Phillips (#1) screwdriver to remove the screw.
3. Lift off the cover.
4. Push outward on the two retaining clips.
Once the clips release, the card will pop up at an angle.
5. Disconnect the wiring harness and carefully pull the card
out of its socket.
6. Reseat the card, following the above steps in reverse order.
 
NOTE: For additional information regarding how to reseat the
mini-PCI card, refer to the Online User Guide.





Disable or remove all firewall applications on the computer in
Microsoft® Windows® XP.
Firewalls can hinder a computer from accessing the Internet,
network, or a network share. For troubleshooting purposes, disable
any firewall software installed on the system. If disabling the
firewall does not work, uninstall it. This includes the firewall
built into Windows XP. Disabling or removing firewall software
will vary depending on which firewall application is running.
Refer to the vendor website to get steps for disabling or removing
the software.
To remove firewall software, perform the following steps:
1. Click the Start button, and then click Control Panel.
The Control Panel window appears.
2. Double-click Add/Remove Programs.
3. Click each of the following items that may be present and
click Remove.
o McAfee Personal Firewall
o ZoneAlarm
o Norton Internet Security
o Norton System Works
o Norton Personal Firewall
o Tiny Personal Firewall
o Black Ice Defender
o E-Safe Desktop
o Sygate Personal Firewall
o Zero Knowledge Systems Freedom Internet Security Suite
o NeoWatch
o Kazaa
o WinMX
o Morpheus
o BonzaiBuddy
Disable the Windows XP Firewall
To disable the Windows XP built in firewall, perform the following
steps:
1. Click the Start button, and choose the Control Panel.
The Control Panel window appears.
2. Double-click Network and Internet Connections.
The Network and Internet Connections window appears.
3. Click on Network Connections.
The Network Connections window appears.
4. Right-click the network connection you wish to disable the
firewall on, and click Properties.
5. Click the Advanced tab.
6. Remove the check from the box labeled Protect my computer
and network by limiting or preventing access to this computer
from the Internet and click OK






Remove the network bridge. (XP)
To remove the network bridge in Windows XP, follow the instructions
for How do I remove network adapters from and delete a Network
Bridge in the Microsoft® Windows® XP operating system?





Change the channel on the access point.
To change the channel, perform the following steps:
1. Follow the instructions in the users guide and change the
channel the access point is operating on to channel 1.
2. Note the signal strength, throughput, and stability of the
connection.
3. Follow the instructions in the users guide and change the
channel the access point is operating on to channel 6.
4. Note the signal strength, throughput, and stability of the
connection.
5. Follow the instructions in the users guide and change the
channel the access point is operating on to channel 11.
6. Note the signal strength, throughput, and stability of the
connection.





Reset the wireless base station/router.
Reset the factory defaults on the wireless router, access point,
or base station. Refer to the Users Guide or device documentation
for detailed instructions on how to reset the factory defaults.





Update base station/router to the latest firmware (not Dell-branded).
Refer to the manufacturers website for the latest firmware revision
for the base station/router. Instructions for the proper upgrade
procedure should be on the website or in the device documentation.
 
NOTE: Upgrading firmware for a third-party base station/router
is not supported by Dell. Refer to the manufacturers support
site for assistance, if needed.





Try a known-good network adapter.
Test a known-good network adapter in this system. For example,
if you have a second computer with a network card, remove the
network card from the second computer and install it in the computer
that is experiencing network issues.
 
NOTE: For more information on installing and removing hardware
in your computer, refer to the Online User Guide.




Attempt to swap with a known-good portable hard drive.
Power the system down and insert a known-good working hard drive
into the system, if available.
 
NOTE: If the user is running Microsoft® Windows® XP, make sure
that they are running the OEM version of the operating system
in order to prevent reactivation.
 
NOTE: For more information on how to reseat the hard drive,
refer to the Online Users Guide.


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