I never noticed this until today when I went to add more space to the Windows 7 drive on my disk. Even though I had Windows XP and then installed Windows 7 my computer shows Windows 7 as Drive C and Windows XP as Drive D. I have no idea how this occurred since i presumed Windows 7 would auto be Drive D with Boot installed to Windows XP Drive C. Now the problem is the actual cylinder boundaries show Windows XP as C and Windows 7 as D but not on the computer opening My Computer. This is something new to me so I have no idea how the computer or Windows 7 install managed to change the drive mapping. Since one cannot just go in and change drive letters does anyone know how to fix this so the drives are correct? Both partition managers I have show it correctly but the computer does not on Windows 7. Reinstalling Windows 7 is a nightmare specially since you have to call to get a new activation and go through about a hour of hoops and loops.