QUOTE(Cheesenium @ Dec 25 2008, 04:29 PM)
Im planning to upgrade my copy of Vista from 32-bit to 64-bit and i have a few questions.
1) Will the software (from games to AutoCAD) that work properly in a 64-bit environment?
2) Is there any performance boost? Any noticeable change in performance in gaming?
3) Is it really worth it to upgrade from 32-bit to 64-bit?
1. Yes, most softwares will work properly even though the software aren't 64-Bit software. They'll just run in "32-Bit Compatibility Mode".

2.a) Yes, there's a performance boost if your using more than 4GB of RAM but for me, when I compare 3GB and 4GB of RAM, I don't feel the difference.
2.b) No, there's no noticeable enhancement in gaming unless the game is 64-Bit (Maybe it'll work better). I'm not sure as I don't play games.

3. Yes, it's worth to upgrade to 64-Bit if you use more than 4GB of RAM. Example: You use 8GB of RAM, you should definitely use 64-Bit. But if you use 4GB of RAM, may as well forfeit the 1GB because only 3GB is utilized.