If your version of Windows is Windows 2000 or later (XP, for example), then
go to:
www.microsoft.com/spyware
and look for links to this beta program download.
PLEASE read all the information on the download page carefully. This is a
beta product, meaning that it is NOT supported by Microsoft, and that there
is significant risk involved in running it. Other users, who have generally
not looked too closely at the items the program recommends removing, have
had significant issues, including temporary loss of network connectivity,
and data loss--mainly MP3 files.
If you have a problem with spyware that you haven't been able to resolve
otherwise, I'd recommend this download. Otherwise, you should consider
whether waiting until the product is released might be the best course for
you.