Most laptops have at least one Control (CTRL) key, and standard PCs usually have two. These keys are used to optimize the other keys on your keyboard by giving them additional functions, such as copying and pasting text.
When one or both of these keys stop working, it can be quite annoying, especially if you have become accustomed to using the keyboard shortcuts that depend on them. This FAQ will walk you through how to repair the problem and can be used on computers running a range of OS devices, including Windows 7.
Repair Laptop Control Keys that Have Stopped Working
To fix this issue, the steps are quite simple. On your keyboard, locate and press the ALT + ctrl + fn keys. This should repair the problem.
If this doesn't work, double-check that they keys themselves aren't clogged with dust or other dirt by cleaning out your keyboard with a specialized keyboard cleaner.
I've never had this issue before, so it was a surprise. Tried few other things from the internet to no avail. Happened across your "how to" article, and worked like a charm. Thanks.
thanks to you