Malware = viruses, adware, spyware.
Make sure your anti-virus is up to date and do a thorough scan. Use an online scanner as a backup. TrendMicro's HouseCall is a good one:
TrendSecure | HouseCall™ Free Scan
Scan your rig with a couple of anti-spyware programs. I recommend Ad Aware and Spybot (both are free and available from
MajorGeeks.com - Download Freeware and Shareware Computer Utilities.). Warez Monater has a much more indepth list posted in the virus forum. If you use Spybot, be sure to let it immunize your system as well.