Seemed to slow my system down, besides the Windows firewall is actually quite decent on Win7.
Chewie - Free anti-virus software is free for a reason.
It's nothing to do with the antivirus. It's the support that's missing.
Free products generally don't offer any support, while, if you buy the same, you're getting access to their support cell.
If you know you can manage without the help of others, I don't see why I should be paying for something I'm not going to use. Heck, I have the Server edition of Quickheal, which costs me about $400 an year, but I havn't used their 'support' yet. If I can do it myself, I can't be bothered to call and explain the situation.
Yes, at times it might just be necessary, and that's exactly what I'm paying for.
On my personal laptop I'm using Vipre antivirus, which 'apparently' is one of the best in the world! (Can't really say I'm happy with it though, Ever since I've installed it, my explorer crashes and boots up again on each restart. Windows 7 has awful compatibility with antivirus software)
They have a dirt cheap license in India - just about $5-6. In the US though, it costs around $30, I think.