From:
http://www.kellys-korner-xp.com/xp_t.htm
Themes (Won't Load or only Windows Classic is listed)
Go to Start/Administrative Tools/Services/Themes. Set to Automatic. Also
check your settings here:
Start/Administrative Tools/Services/Terminal Services/Log On. At the bottom
ensure that Hardware Profile Original Configuration is Enabled.
If the above doesn't apply/nor help: Only windows Classic is listed under
Appearance:
1. Right click on the desktop and choose Properties.
2. On the Theme tab, choose the Windows XP.
3. If this option is missing, you may choose Browse... to
C:\Windows\Resources\Themes\Luna.theme
4. The Luna.theme is the theme of the Windows XP.
If Luna.theme is missing: Go to Start/Run/Msconfig/Expand Files: Luna.MS_
and Luna.TH_
Restore Luna Theme (Line 187)
http://www.kellys-korner-xp.com/xp_tweaks.htm
Restore Themes Functionality (Line 187)
http://www.kellys-korner-xp.com/xp_tweaks.htm
Windows/Buttons Greyed Out under Appearance and/or Windows XP Style Changes
to Windows Classic or (Line 214)
http://www.kellys-korner-xp.com/xp_tweaks.htm.