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#251
Some are free for personal use because they either lack a few extra features plus it's great advertising for companies considering purchasing the 'full' versions.
Word of mouth goes a long way.
As for MSE, MS have a reputation to uphold/improve. Good rep = $$$ from Large scale companies.
Having a viable and free A/V that competes with top end 3rd party products, adds to the pros/cons when companies contemplate purchasing / upgrading MS products.
KIS2010
Lavasoft Ad-Aware Pro
Personally I use Microsoft Security Essentials - it has everything I need and is really simple to install. Best of all it's free and from MS. So you know there is reputation on the line.
If you want to see a screen by screen feature set of Security Essentials try: Screen-by-screen Exploration of Microsoft Security Essentials on Windows 7
The installation step by step info can be found here: Installing Microsoft Security Essentials on Windows 7
--cheers
Norton IS 2010 (realtime)
Ad-aware Free (on demand) or Malwarebytes (on demand)
UAC off
firefox with all addons disabled
ccleaner
wireless with wpa2
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had MSE for a while and picked up a google redirect virus
MSE + Mbam (real time protection)
S&D (browser immunization, teatimer not used, on-demand scan rarely used)
Hitman pro (my on-demand scanner)
Windows firewall with windows 7 firewall control (firewall)
additional security software:
Sandboxie
Prevention really is better than cure when it comes to malwares.
Regular System Image and regular back ups is always recommended.
Ciao!