this is it, how much is the data worth ?
I done computer repairs for a while and it's the preservation of existing data which takes the time and costs the money. I always used to recommend a new disk as that was the best way of ensuring no data was lost .yes you can copy all of 'my documents' folders across, but a lot of programs don't store data there, and it's going to be rather difficult to get it back once you've reformatted and reinstalled the OS.
Martin