Snoopware/Spyware/Adware Removal Tools:

AdAware
Spybot Search & Destroy

More useful tools:

HijackThis
CoolWWWSearch.SmartKiller
CWShredder
KazaaBGone
Shoot The Messenger
Start Up List
Kill2Me

Virus/Trojan Tools:

Norton Antivirus
McAfee VirusScan
Panda Active Scan Online
TrojanRemover

CLICK TO VIEW LASTEST VIRUS ALERTS

More Reading

Spyware Help
How to use Spybot
How to use Hijack This
PC Maintenance Tips and How-to's