Yeah I know its made by MSI for Medion. I already have the manual. Well it was sold to me by PC World a good few years ago (a while before any 64-OS were available) and was their top of the range PC at the time LOL, I was told though that it would support a 64-bit OS. Basically I have been sold a PC with a 64-bit processor but with a mainboard that cannot fully support a 64-bit os, it won't install without totally disabling USB. I thought that updating the bios may help. I can't think of what else to do. If I install without USB and then turn on USB after a clean install it gets a BSOD error before loading the os. The same as if I try to install the os with the USB turned on. I will make note of the exact error code and post it here a little later. Cheers.