Download: a-squared Free 22.214.171.124 - Spyware Scanner
The Free edition of a-squared is one of the best malware scanners, which you don't have to pay for.
The scanner can't find viruses though, but all the other artificial vermin, like Trojans or spyware. The gratis software a-squared sticks to the basics: Background scanning and automatic update function aren't included and you have to start the scanner manually.
You can use a-squared with Windows Vista, too. In June the new version 3.5 was released, but nearly every day there are additional updates - see the changelog for detailed information. You can download the tool at Emsisoft.
MSI Afterburner 4.3.0 Final: Geniales Tweak-Tool für Grafikkarten im Download