hi silbylaw
i have also tried looking for info. on the sasser worm and what i found to fix the problem is this a manually removal but didn't work it might work for somebody else so i'll leave it here
You can also remove Sasser manually by following these steps.

1. Disconnect your computer from the Internet.
2. Boot in Safe Mode by pressing the F8 key during startup.
3. Navigate to your Windows directory (c:\WINDOWS or c:\WINNT) on your hard drive.
4. Look for a file named AVSERVE.EXE. Delete it.
5. Click on the Start menu and select Run.
6. Type "regedit" (without quotes).
7. Navigate to the following Registry key:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
8. In the windows to the right, look for a value called avserve. Delete it.
9. Exit RegEdit.

Reboot.
Another question does any body knows how to enable the win xp firewall thanx for all your solutions but wont work. I am trying to think that is is a hardware problem but if there is any other solution for this i would thank you so much if you guys share it with me.