go to
http://vil.nai.com/vil/stingerdownload it.
Install AVG from Grisoft (linked above).
Download Spybot and Adaware
search for them on download.com , free anti-spyware software.
Install them all and turn off the PC. (stinger doesnt have to be installed, just leave it on the desktop).
Start the PC in safemode (press F8 once per second while the PC starts up, from teh text menu select "safemode" by itself - no networking etc) Log in as an administrator (or an account with admin rights).
Start a complete scan from teh AVG test centre (start>> programs>> AVG)
when thats finished, double click stinger and click browse to add other partitions, then scan now to set it going.
Run a scan with spybot.
Run a scan with adaware.
restart the PC and let it start up normally.
note: if you have ME or XP, disable system restore before going into safemode (right click my computer>>properties>>system restore>> tick the disable the box) for winME I think it's hidden in the performance>>advanced tab.
Also, dont forget to update AVG (either auto update or download the .bin files from teh website and point to the folder you save them in) before you run it.