So, I just discovered that my processor is x64, but my Windows is normal PRO XP x32 (AMD 64bit Sempron 3000+). Should I get aMicrosoft Windows XP Professional x64 Edition? Would there be any benefits?

Edit: and what does Windows Vista Hardware Ready mean? I've got it on the box.

I'd say yes.
The difference would be something like between Win3.1 and Win95 in terms of performance (3.1 = 16-bit; 95 = 32-bit).

Windows Vista Hardware Ready means only that your machine falls within minimum hardware requirements for Vista.

Is it true that some games do not support Windows XP Professional x64 ?

I remember there were such issues, especially with games copy-protected with StarForce.

Okay. Thank you.

<div class='quotetop'>QUOTE(the_fifth_horseman @ Jun 5 2007, 10:38 AM) [snapback]293037[/snapback]</div>Not trying to be a jerk here, but this statement isn't entirely accurate. Windows X64 really won't show much of a performance increase if you're just using the computer the same way you are now. You'll still be using mainly 32 bit applications because there aren't a lot of 64 bit ones available, and the ones that are out there aren't really for 'ordinary users' like you and me. There do happen to be a lot of 32 bit apps that don't like WinXP x64 as well, and as for gaming performance (especially in 3d gaming) most tests people have run show no noticable increase in performance. Now, if you're a programmer/coder/developer of some type, then you'll notice a great increase in the way of compiling and such. It's just that most people won't even be using code optimized for a 64 bit OS.

Just google "xp 64 vs 32" and you'll see what I'm talking about.