to disable
User Key: [HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System]
Value Name: DisableCMD
Data Type: REG_DWORD (DWORD Value)
Value Data: (0 = default, 1 = disabled, 2 = disabled but allow batch)
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/cmd.mspx
User Key: [HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System]
Value Name: DisableCMD
Data Type: REG_DWORD (DWORD Value)
Value Data: (0 = default, 1 = disabled, 2 = disabled but allow batch)
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/cmd.mspx