|In effect echoing Ed above and picking up on Mavis's post too... |
Why the need to reformat?
Is the XP disk you have a recovery or full (or upgrade) disk?
Have you safeguarded your data - all those files, images etc you wouldn't want to lose... (as in copied off the hard-drive to external media - optical or another haard-drive)?
Better to consider and answer those points first - before going down the reformat path...?