The Dell wireless 1390 WLAN Mini Card wireless card(Chipset BCM4311/BCM2050) is in a Dell Inspiron E1505(running Win XP with Service Pack 3).

The Dell Wireless WLAN card utility has a diagnostics option to check the card. I ran that and the hardware(wireless mini card) was
found to be OK. Updated the drivers which did not help so removed and reinstalled the drivers, but that too did not help. I tried using the
Windows wireless configuration utility(and disabled the Dell Wireless WLAN card utility), started the Wireless service, but
that did not help.

Then, tried the Dell Wireless WLAN card utility(after disabling the Windows wireless utility), but that was futile too. It cannot detect any wireless network
at all.

Followed suggestions of http://en.community.dell.com/support-forums/network-internet-wireless/f/3324/p/17946577/18520047.aspx
but that did not fix the issue.

Checked each property at
http://support.dell.com/support/edocs/network/wlan/en/UG_EN/props.htm#toc_65

There are no issues with acccess point. Next to the Dell Inspiron E1505 is a Dell latitude(having an Intel wireless card) which can connect
to the wireless network.

Also, when the computer boots there is a message "Notification dll
has not been registered program will not work correctly"

Followed the suggestions at
http://help.wugnet.com/windows/wireless-connection-service-wont-start-boot-ftopict628131.html

Opened a command prompt and typed

regsvr32 atl.dll click [OK]
regsvr32 wltrynt.dll [OK]
ipconfig /flushdns [OK]
ipconfig /renew [OK]
netsh winsock reset [OK]

Rebooted the machine, but still there is a message "Notification dll
has not been registered program will not work correctly"

What else can I try?