cheetah05
Internet mainly, possibly borrowed discs.
Better to have protection, than have not.
If you are solely using as a HTPC, I would not even bother using antivirus etc.
For pc still use avg + Spybot SD + Windows Firewall, have firewall activated on router as well.
Regards
...I was using AVG Free w/XP firewall up 'til now. However, I find AVG's pop-up dialogs during updates irritating...