Try This at School
I found this and it seemed promising, so i thought I'd share it with you.
Allowing dos and regedit in a restricted Windows
A very simple tactic is to open notepad and type the following:
REGEDIT4
[HKEY_CURRENT_USERSoftwareMicrosoft continues...
WindowsCurrentVersionPoliciesWinOldApp]
"Disabled"=dword:0[HKEY_CURRENT_USERSoftwareMicrosoftcontinues...
WindowsCurrentVersionPoliciesSystem]
"DisableRegistryTools"=dword:0
Save it as something.reg then run it. Simple.
Give it a try and see what happens, you never know.
This is from blacksun.box.sk/tutorials, take a look.