A few days ago, Microsoft released Windows Defender, which is the second beta version of Microsoft AntiSpyware. This is actually a good piece of software from MS 🙂
It really does do the trick. Be sure to try out the explore processes function to quickly pinpoint malware.
Only downside: it is not yet possible to be used without a valid Windows installation.
(Dutch) Article at Software updates [ Windows Defender beta 2 ] [ tweakers.net ]
Download link [ microsoft.com ] (Use this to also validate your Windows installation.)
Direct download link [ fileforum.betanews.com ] (If you have already installed the validation tool.)