There are recent links there to where you can get Ad-Aware and Spybot. If you download them, open and update signature files, and run a scan with each of them, it may find the offending crudware.
If you're running WinXP or Win2K, you can also go to microsoft.com and hunt up their "malware remover" which is updated weekly and will remove the most common recent problem stuff. Look for "downloads." Note that this is a "one-shot" program. You need to go back and get the latest version each time you need to run it, and it's not intended to be a "comprehensive-gets-everything" kind of fixer.