if it wont let you run cmd.exe just run command.exe (or just command in the run box) ive found it will run when cmd.exe is disabled =)

this is on a win2k and xp box however...win*x only has command.exe and cmd isnt on win*x

to shut down a pc you have admin rights on...make a scheduled task in your windows (or hers, she probably wont find it) and have the shutdown command shut the pc off at *0pm