Just a generic question--I just rebuilt my comp using a new cpu, mainboard, memory, graphics card and cooling system-I am using my old hardrive with all my programs intact-Is it advisable to reinstall my windows xp--As an aside, I have a usb device that my "new" system absolutely will not recognize ( a usb dvd/cd writer that was working before the upgrade)--I was advised by a friend that it might be best to do a reinstall, What do you think?--Thanks in advance!