When it comes to PC protection, I use a combination of Trend Micro Office Scan with a corporate licence I believe, SpyBoy Search & Destroy, Windows Firewall and Windows Update regularly checked. But my Trend Micro is starting to get on my nerves particularly because of the fact that I cannot modify the settings of it without a password (I don't have it) and it blocks some websites which it deems to be not so safe despite them being so.

Can anyone offer any recommendations of a reliable antivirus? I'm talking here about free antivirus programs, and probably the only one I would buy would be Norton because I have used it before.