Avast Bro ...
Avast is annoying. It's just an ugly interface and it talks to you

Get Microsoft Security Essentials.
Avast Bro ...
Ugly interface? Clearly you didn't use common sense when installing it then!
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And voice confirmation messages can be turned off with a few clicks.
Security Essentials is good for the average user but it's not good for big folder browsing especially over LAN environments because it takes far too long and uses near 100% CPU heuristic scanning files - a bug that has been in MSE since the BETA.
Ugly interface? Clearly you didn't use common sense when installing it then!
I have a spare copy of Win7 thanks to the student offer and I was thinking about installing it on my parent's PC, as it chugs under vista.
It doesn't handle running firefox and itunes at the same time, let alone adding Word into the equation. I've disabled even the aero basic theme and I am using the windows basic theme.
So, will I see a performance increase if I upgrade to win7, or would it be a waste?
The spec:
Athlon x2 4000+ 64
2Gb Ram
xfx 8400gs 512Mb
320 gb HDD
Vista runs like a 2 legged dog on 2gb ram, imo
Unlike XP, Vista and Win7 won't get bogged down by running processes that don't use any CPU time.