Lock Your PC with a USB flash drive to Stop Others From Using it in Your Absence

WinLockr isa great tool that allows us to lock our computer just insert your USB flash drive. This is useful for those who do not like that we use the computer when we are absent or downloading something.

Its use is very simple and Acon block insert the USB, so if you do not enter the password can unlock the computer.

Link: WinLockr