I have had a MyWinner locker & Yo Safe installed on my laptop by another person that I quite frankly do not trust. How do I unlock them to see what they have placed inside?
The other person needs to give you the password or else you won't have the possibility to access the contents inside the apps. You shouldn't give anyone the possibility to install apps on your computer. Run a copy of Combofix and wait for the removal of the applications, but still the best way remains the one in which the other user gives you the password. If he refuses, force the app's uninstall procedure with Revo Uninstaller.