Few things, have you run a full virus test? also Scan for spyware or adware. click here for AdAware, click here for Spybot. Both are free and effective at removing unwanted guests.
Run a search for winsock.dll and wsock32.dll
Winsock.dll should be in c:\windows and
Wsock32.dll should be in c:\windows\system
If you find any other copies post back.