I DO NOT RECOMMEND DOING THIS ON A SYSTEM WITH MANY APPS INSTALLED, ONLY ON FRESH INSTALLS

I recently went to reinstall Windows XP on a brand new Dell 755 after enabling RAID 1. When finished, I noticed the system drive was H, not C. It probably would have been just an annoyance, but I didn't want it like that. Here is what I came across as a solution:

1. Start Regedit.exe.
2. Locate the following registry key:
   HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
3. Find the drive letter you want to change to. Look for "\DosDevices\C:".
4. Right-click \DosDevices\C:, and then click Rename.
5. Rename it to an unused drive letter "\DosDevices\Z:".
   This frees up drive letter C.
6. Find the drive letter you want changed. Look for "\DosDevices\D:".
7. Right-click \DosDevices\D:, and then click Rename.
8. Rename it to the appropriate drive letter "\DosDevices\C:".
9. Click the value for \DosDevices\Z:, click Rename, and then name it back to "\DosDevices\D:".
10. Quit Regedit.
11. Restart the computer with the XP CD inserted.
12. Boot to the Recovery Console.
13. Run FIXMBR.
14. Run FIXBOOT.
15. Restart the computer with the XP CD inserted, again.
16. Press enter to install Windows, then F8 for the license.
17. Select R for repair install and select "C:\Windows".
18. Go through the final stages of installation and you're done.

I DO NOT RECOMMEND DOING THIS ON A SYSTEM WITH MANY APPS INSTALLED, ONLY ON FRESH INSTALLS