I know you don't have an XP disk, but what sort of restore disks do you have (if any)? Going by your earlier posts, I don't think that you have any option but to reinstall Windows.
Did you PC come with any info as to how to restore it to factory condition? It may well be too late for that though at this stage if the data is hidden on a partition on the hard disk.
If you have no access to an OS, you may well have to purchase one.