Originally Posted by mule

Yep, sounds like you're in deep kaka

On a serious note though: go to google and do a search for "kaka://C:\WINDOWS\sysguard.exe/netalert.htm"

Also, hit Ctrl/Alt/Del and check which processes are running. Do a search on google for the processes that look fishy.

HijackThis, Spybot Search and Destroy and Adaware are all free, and between the 3 of them (and some research on Google) you should manage to kill them all off.