I had my dell motherboard changed by dell b/c it wouldn't boot. They sent a tech over to install a new motherboard, after that my amd 5000 x2 now reads as an Athlon 64 +7200 single core. I've checked my hardware tab, only shows one processor. Cpuz reads it as a single core new orleans, and in task manager it only has one processor bar. I've tried installing the drivers for the processor, removing the cmos battery, and also updated the bios on the dell website, and also tried to reinstall vista ultimate 64bit only to get an error saying that I can't run in 64bit mode. I've also have spent the past couple of the days on the phone with dell, and they seem like they don't know anything. So if anybody could help me, it would be greatly appreciated.