benefits of 64 bit?
Stability... never had any stability problems on 32 bit win7
RAM address limit... I've never noticed the difference between 3.5 or 4GB ram.
security.. No security problems on my 32 bit OSs for probably over 5 years.
So why am I trolling, not making the smart choice, and wasting my time.
You tell me
benefits of 32 bit?
Stability... my W7 32bit laptop is less stable than my overclocked W7 64bit PC. May be unrelated issues, but I've never had any problems on 64bit.
RAM address limit... if I wanted 3GB of RAM I wouldn't have bought 6GB. OK, maybe 3.5 -> 4GB isn't much of a difference, but if you want any more, you might as well have that higher limit.
Security... No security problems here on a 64bit OS.
Thanks, My main concern is drivers. I have a Dell xps 420 running 32 bit Vista... The dell website has no drivers for Windows 7 so would vista 64bit drivers work with windows 7?
True, but you don't NEED to get drivers from Dell. You can still get drivers from the manufacturers' sites, and they're likely to be more up-to-date. And, like Chokka said, Windows 7 does a very good job of installing drivers. I didn't need to install any. The only ones I've actually installed are updated graphics drivers, but I haven't noticed any fps increase over the ones W7 gave me. Also, yes, Vista 64-bit drivers do work with Windows 7.
Plus, W7 will happily run any 32-bit program, so incompatibilities aren't an issue now. I believe you can force an application into 32-bit too, by adding a command to the shortcut. That'd fix your iTunes and Media Center problems. I can say I haven't had either of these (or any, in fact) problems in Windows 7 64-bit, but then, I only use iTunes a little, and I don't watch many MKV files.
To me, the RAM limit was the main factor. Seeing as how you'd only gain a little more available RAM, it might not be worth it to you (even though there are absolutely no foreseeable downsides).
I'd go for x64, you want x86. It seems there will be no way to convince you otherwise, so do what you want.