So I've had the same PC for about 4 years now. Its an HP Compaq dc5800 SFF, and it had windows vista running on it. Well, about a month ago I restored my PC cause it was in storage and it was really slow when I booted it up for the first time. I had to restore it to XP (SP3), because that was the only disk I had and I needed a fast PC for my games. The problem now is that I used to have 64 bit java and I could allocate more RAM for a game i played but now when i tried to get 64 bit java, it says my PC isn't 64-Bit anymore. I'm guessing that maybe XP cant be 64-bit or maybe i used a 32-bit CD when I restored? Any help would be great!