I've been using Avast (free) and I love it.
AVG 6.0 Free Edition only scans about 49,000 files. NAV 2002 scans about 122,000 files (every time).
AVG Free is set to test all file extensions, archives, and compressed files in the hard drive (C:\) as well as Integrity Check and Heuristic analysis.
I understand AVG free tests the full system upon installation and there after only files witch have changed since the last test. However, to my recollection AVG Free only tested 17,000+ files upon installation.
Is this variance a big deal? Or is NAV just better?
Since AVG is free I am limited to only the Help and FAQ. And my NAV subscription will expire soon and I need to decide weather to renew. Any help to understand what is going on here would be greatly appreciated.
I am using Windows ME, and IE 6 SP 1 and Internet Tools. Microsoft patches and virus definitions for AVG Free and NAV are up to date.
Thanks. Have a great day.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic