Want to keep your computer running without anyone else being able to shut it down?

Then disable the Shut Down command. Here’s how:
Open your Registry Editor. (If you’re new to editing the Registry, check www.WE-Compute.com/registry.html for instructions.)
Go to HKEY_CURRENT_USER\ Software\Microsoft\Windows\Current Version\Policies\Explorer.
Create a new value by clicking Edit and New DWORD value. Right-click the new value and select Rename. Type NoClose and press Enter. Double-click the new value and under Value data type 1 (one) to disable the Shut Down command.
If at a later time you wish to re-enable shutdown, change the Value data to 0 (zero).