i have two OS on my hard drive, but one is corrupt. Its still there, but not working. How do i do a clean installation without loosing my files(deleting partition)?
Im not 100 percent on what you want but I think what you want to do is put the xp disk in and boot to it then delete the partition that the corrupt install is on. But if you have files on that partition then back up the files before deleting it.
If you only have a single partition with both OS running on it, why don't you backup your files to external drive or DVD? All you'd have to do then is do a clean install of a single OS and restore the files.
If the corrupted OS is on a different drive than C and still accessible then just backup your files to C, format that drive and move the files back.
If on a different partition than C and corrupted then you'd have to try and use one of those partition recovery software.
I think you have two partitions, both currently with OSes, and you want to remove one. What you'd have to do is copy your data to an external HD or DVDs or something, then format the disk, and put your files back on.