The most effective way to ensure that nobody uses your computer in your absence is, directly, blocking it, and with MRT Lock you can do it with just one click.
To unlock MRT Lock you simply have to press a combination of keys that you decide beforehand. It can also be programmed to lock automatically for a predetermined time, in seconds, that you specify.
If the user wants, he can indicate that the program is activated as soon as the computer is turned on, and that only with the key combination can it be unlocked. MRT Lock is a very simple program, totally free, and that hardly consumes system resources.
You can free download MRT Lock 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.