How to join Windows XP Media Center Edition 2005 to a Domain

I recently purchased an XP Media Center 2005 PC and when I tried to join it to my Windows 2000 Domain, I noticed the option was 'greyed out.' I had remembered testing MCE(Media Center Edition) before and it joined the domain fine. Further research revealed the Microsoft has removed the option from the 2005 version of MCE. It turns out that there is a single registry key that enables and disables this feature. Here are the steps to re-enable domain compatibility.

• Insert any Windows XP CD.
• Boot to the CD and choose 'Recovery Console'
• Select the installation to log onto (default: 1) and press
  Enter. (Most likely the administrator password will be blank. If
  it is not enter the password you set or contact the manufacturer.)
• Type cd system32\config and press Enter.
• Type copy SYSTEM c:\ and press Enter.
• Type exit and press Enter.
• Boot the PC back into Windows
• Start > Run > Type: regedit and press Enter.
• Click on 'HKEY_LOCAL_MACHINE'.
• File > Load Hive...

• Browse and select C:\SYSTEM
• Specify key name 'TEMP' and click OK.
• Expand: HKEY_LOCAL_MACHINE > TEMP > WPA > MedCtrUpg
• Change the IsLegacyMCE value to 1 and click ok.(one, not an L)
• Click on TEMP subkey (under HKEY_LOCAL_MACHINE).
• File > Unload Hive. Confirm.
• Reboot the PC.
• Boot into the Recovery Console using the Windows CD again
• Select the installation to log onto (default: 1) and press
  Enter.
• Type cd\ and press Enter.
• Type copy SYSTEM C:\WINDOWS\SYSTEM32\CONFIG\SYSTEM and
  press Enter.(Choose 'yes' to overwrite)
• Type del SYSTEM and press Enter.
• Type exit and press Enter.
• Boot up Windows.
• The 'Join Domain' option should no longer be grayed
  out.