Step 1: Download newest versions of Ad-Aware, Spybot, and Hi-Jack This
Ad-Aware:
http://www.lavasoftusa.com
Spybot:
http://www.safer-networking.org/en/index.html
Hi-Jack This:
http://www.spychecker.com/program/hijackthis.html
Step 2: Restart computer, boot into safe mode.
Step 3: Run Ad-aware and update definitions then check for spyware
Step 4: Run Spybot and update definitions then check for spyware
Step 5: Run Hijack This and update it then check for possible Hijacks
Step 6: Run Msconfig (type "MsConfig" into the run command), on startup, uncheck any boxes of programs that you do not want starting up.
Step 7: Run your antivirus program, update definitions, then check for viruses/bots/trojans.
Step 8: Restart computer