I have a Compaq 6910p with MS-Windows XP Pro with Service Pack 3. I have some reason to suspect that minor parts of the OS - mainly support systems for Internet Explorer, but also parts of the software update mechanism - have been damaged. This computer did not come with Windows disks. Back-up of the OS is supposedly on a separate partition, drive D:. Can I do a repair install from this? If so, can someone give me or point me toward instructions for doing so? Thanks!