You need a 64 bit os to use more than 4GB of RAM not 6 just to clarify. You can run 32 bit programs on a 64 bit operating system and shouldnt have any issues, you just need to make sure you get 64 bit drivers as 32 bit drivers wont work.
thank for the quick reply....but i'm in a tight budget....the earlier options is the only hope.... btw what do you mean with 64bit drivers? its for the hardwares(g/card, mobo etc)? or its for other purposes?