Actually, I think you can use the Group Policy editor to enable a normal user to play PB-enabled games on Windows. Nevertheless, no such crap is necessary with Linux.
You must run the game as the Administrator or equivalent account under Windows. If you do have access an admin account, you can right click on the application you want to run and select "Run As". This will allow you to give admin access to that program and should allow you to play with a limited user.