I had the same wireless problem on an Inspiron 1150 with the Dell Wireless WLAN 1450 Dual Band WLAN Mini-PCI Card and a Linksys WRT54G.  By right-clicking My Computer, selecting Manage then going to Device Manager, the 6th one down in my list, I looked for Network Adapters and Uninstalled the Dell Wireless WLAN 1450 Dual Band WLAN Mini-PCI Card by right-clicking and slecting uninstall.  Make sure you have the driver on your hard drive a CD-ROM or USB Drive or some place BEFORE you delete the adapter.  Then I rebooted and I had to run the WLAN install program: R83097.EXE to get it working again.

 

The accessories folder is just a bunch of shortcuts that can be copied from one of your roomates All Users ... Accessories forlders: C:\Documents and Settings\All Users\Start Menu\Programs\Accessories.  If the programs are no longer on your hard drive, try going to Control Panel, Add/Remove Programs, Add / Remove Windows Components and Unchecking Accessories and Utilities click Next then go back and check Accessories and Utilities to try and reinstall them.  You will need your Windows CD and possibly any service pack CD's that have been installed.