As you probably know if you’re reading this, you can join Windows XP Medic Center Edition to a domain at install, but it won’t let you afterwards. Well here’s a work around:
Insert Windows XP CD.
1) Start > Run > D:\i386\winnt32.exe /cmdcons (Replace D with the drive letter of your cd drive)
2) Acknowledge prompt by clicking Yes.
3) Skip updating process by clicking Cancel or by pressing Esc
4) After installation, acknowledge success msg. by clicking Ok
5) Start > Shutdown > Restart
6) At boot menu, select Microsoft Windows Recovery Console
7) Select proper installation to log onto (default: 1) and press Enter (If prompted, enter Administrator password and press Enter)
8) Type cd system32\config
9) Type copy SYSTEM C:\
10) Type exit
11) At boot menu, select Windows XP Media Center Edition
12) Start > Run > Type: regedit and press enter
13) Click on HKEY_LOCAL_MACHINE.
14) File > Load Hive…
15) Browse and select C:\SYSTEM
16) Specify key name BANANA and click OK
17) Expand: HKEY_LOCAL_MACHINE > BANANA > WPA > MedCtrUpg
18) On the right-hand side, double-click IsLegacyMCE value
19) Change selected value to 1 and click Ok.
20) Click on BANANA subkey under HKEY_LOCAL_MACHINE.
21) File > Unload Hive. Confirm.
22) Start > Shutdown > Restart
23) At boot menu, select Microsoft Windows Recovery Console
24) Select proper installation to log onto (default: 1) and press Enter
25) If prompted, enter Administrator password and press Enter
26) Type cd\ and press enter
27) Type copy SYSTEM C:\WINDOWS\SYSTEM32\CONFIG\SYSTEM and press enter
28) If asked if you want to overwrite files, say yes
29) Type del SYSTEM and press enter
30) Type exit and press enter
31) At boot menu, select Windows XP Media Center Edition
32) Join domain as you normally would