I goofed up a reg file and had to reformat. I lost my windows 7 64bit disc and I have only CD's no DVD's laying around so I decided to try out XP Professional 64 since I can put that ISO on a CD. Here is the error I'm getting right now..... Microsoft Corporation - Other Hardware - Microsoft UAA Bus Driver for High Definition Audio. I'm also getting a lot of unknown devices showing up in the device manager. They don't have any information on them to look the DEV or VEN up. I'm thinking I might not have drivers for the MO or something installed. The computer came with vista and later I upgraded to 7. I don't know if I'm just missing something or if this computer can't work with XP? Any help will be great. I'm going to be at this all night lol. Thanks!