My entire PC career began with an old Sony with XP, complete with installation disks containing OS and apps. As time went on I bought a Dell with XP with restore disk; then the HD died (it was a refurbished model off an auction site.) My question is: if I buy a new HD for the Dell and install the recovery disk, will that give me a working computer? Or should I install the installation disks from the SONY first, then update it with the XP? Or should I forget the whole thing and sell the Dell for parts?