Try this
1. Try pressing both the left and right CTRL keys at the same time andsee if that releases CTRL.2. Go to Start / Settings / Control Panel / Accessibility Options /Keyboard Options.Turn off CTRL lock if it's on. If that solves it and to avoid future problems, press "Settings" Turn off "ress modifier key twice to lock".Turn on "Turn sticky keys off if 2 keys are pressed at once".Or turn off "Use shortcut"