Avast! Anti-Virus is a robust program that offers a boot-time scan.  This is a scan that runs prior to the Operating System fully loading drivers, startup programs, or other places where viruses or trojans can hide from scanners.

I searched the Avast site and could not find a simple link demonstrating how to enable the boot-time scan, so I did a few screen captures and put together this FAQ.

After starting Avast! anti-virus from the Start Menu

1) Click the arrow shown

2) Select Schedule Boot-Time Scan

Click the Schedule button

Select Yes

Related links:

http://www.schmahl.net/everydaysw.php

http://www.schmahl.net/security.php

http://www.avast.com

Schmahl World Computer Assistance, LLC

this page:  http://www.schmahl.net/avastbootscan.php

updated June 21, 2006