Imagine Olivier in MARATHON MAN interrogating Dustin Hoffman's character ..."Is it safe?"
The Windows Live Safety Center (Beta) launched a few months ago, and provides you with a FREE, frequently updated, on-demand virus scanner which you can use to scan your machine for such threats as worms, Trojans, backdoors, and some user-mode rootkits.
Did I mention it is FREE?
The virus scanner on the Windows Live Safety Center beta site runs a scan of your computer only when you visit the site. It does not run periodic scans of your system, and does not provide features to prevent you from getting infected with a virus in the first place. It simply helps you get them off once you've gotten infected.
The site has other nifty add-ons, such as the top threats box;
An active-X download is required. Highly reccomended.