try using something like "sure delete" that program somehow overrides problems like "cant delete because its locked" its just the school bully of deleters, and its free. google it, i dont remember the site.
The removal tool will remove the registry entires for you, now the files are gone you should be fine.
You need to install a firewall on your system asap to prevent further problems. Also you need the security patch from windows update however w32.welchia will probably have already applied this patch for you (it does that, how nice).
The file "C:\WINDOWS\System32\wins\svchost.exe" is deleted.
W32.Welchia.Worm has been successfully removed
from your computer!
Here is the report:
The total number of the scanned files: 110517
The number of deleted files: 1
The number of repaired files: 0
The number of viral processes terminated: 0
The number of viral services deleted: 2
The number of registry entries fixed: 0
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS