I am about to upgrade my motherboard an CPU ( my computer is running xp pro) and i was wondering if i would have to reinstall the OS? Because i have talked to people that stay you wont have to and others that say you will, it is really confusing I would also like to know if i had to reinstall it would i be able to with a backup disk i have created or would i have to use the original software disks ( which i don't have) thanks for the help in advance