First, if you don't have WinXP SP2, get LSP-Fix - a free program to repair
damaged Winsock 2 stacks http://www.cexx.org/lspfix.htm
save it because you might need to repair the Winsock 2 stacks after removing
the culprit.
For WinXP SP2 this command will restore the Winsock stacks if you can't
connect after clearing the malware.
Go to Start | Run and type
CMD
In the command window type
netsh winsock reset