My system is 'cleared' by MS upgrade advisor to convert to Win7 32bit. The upgrade says to use an external drive to transfer my XP programs. My C: is 600 GB and 76% free. My E: is 300GB and 99% free (recently formatted). Can I swap hdd's and list my current E: as C: and begin a clean install; thereby keeping my XP programs and file on the now E: drive?