I found out within the past few days that my HP Pavilion computer needs a motherboard. I'm certainly not going to buy the HP replacement. I have a Windows 7 upgrade package which I have NOT yet installed. My question is: If I change the mboard and use my existing harddrive which is OK will the upgrade package recognize that I've changed the mboard and not install or is the pertinent information all on the drive. I'm thinking if there is a problem it will be in the BIOS. Any help will be appreciated.