Download Desktop Lock
Desktop Lock is a powerful security application that locks your computer desktop disabling the user access to any applications or folders on it. This guarantees you that no one except yourself will use the computer while you are away, making it a very effective security measure. Desktop Lock allows you to partially block your PC with what it’s called virtual screen, this means you can determine which programs can be used and which ones will remain blocked. You can also set automatic blocking or unblocking given certain hours. It is free to try for 21 days, the it’s $24.95 to purchase. It´s an amazing tool!