Technical difficulties

The Vaio is acting up, I know its a software issue, I know I need to do a system repair unfortunately I have no clue where my original XP disk is. That means to this either A) wipe and reload the whole shebang(which ain happening too much data and stuff on here) or else find a new PC at a decent price and slowly work on the vaio later. And by slowly I mean just that, do the HD upgrades I was planning to do, do the memory upgrades and possibly throw windows 7 on there.