avast! 4 Home Edition is a full-featured antivirus package designed exclusively for home users and non-commercial use .
Changelog Version 4.7.942, January 15, 2007
* Standard Shield works on Vista 64bit again
* fixed problems with (missing or non-functional) resident protection virus warning popup, occurring on some systems
Download: Free avast! 4.7.942
Link: Free registration (required)
Link: avast! Home Page