In reply to Mr.Ric:
> If you've got a 64bit processor no reason not to get 64bit windows, the driver problems were years ago.
Well, more that if you have old peripherals that are discontinued, then they won't have 64-bit drivers for them. 64-bit windows depends on manufacturers writing 64-bit drivers.
If you have all recent stuff, then it shouldn't be an issue.
And, for what it's worth, last time I looked, everybody's favourite "free for personal use" firewall - ZoneAlarm - didn't work on 64-bit Windows (Vista).
Although it looks as though they've fixed that for Vista and W7, but not XP 64-bit.
http://www.zonealarm.com/security/en-gb/system-requirements-zonealarm-produ...