There are a few very good choices: 1) AVG Free or 2) Antivir

As of this writing the usual AVG free site is not working, but Antivir is very good. See the link below:

http://www.free-av.com/

If you need help with this, we can do it for you remotely. Just give us a call toll free at 1-866-631-0985 from anywhere in North America. Obtain free computer information and paid support at http://www.DrOrdi.com/qanda-e.html