Remove Hijacks in Browser
http://www.download.com/HijackThis/3...ml?tag=lst-0-1
Firewall
http://www.download.com/ZoneAlarm/30...ml?tag=lst-0-1
Remove Malicous items
http://www.download.com/Ad-Aware-SE-...ml?tag=lst-0-1
Keep out Malicous items
http://www.download.com/Spybot-Searc...ml?tag=lst-0-1
Find out whats open on your computer to hackers
http://www.download.com/DiamondCS-Po...ml?tag=lst-0-1
AVG Free AntiVirus much better than Norton
http://www.download.com/AVG-Anti-Vir...ml?tag=lst-0-1
ps: try using the advanced setting on all programs to really remove hidden items, this will take effort