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The Ctrl, Shift and Alt keys on my laptop have stopped working, both the left and right ones. I have searched for solutions to this problem but I cannot find anything that works.

What can the problems be and what should I try to fix this ?

I have an Acer Aspire 7736ZG laptop, the OS is Windows 7.

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Can you clarify this means for everything or only with other keyboard presses. If you press alt on your browser, does it select the File menu? What happens if you press the left shift key 5 times quickly? –  Dave Sep 7 '12 at 11:33
    
Yes, this is for everything, not only key combinations. Pressing alt will not change focus to the top menu and repeatedly pressing the shift key will not bring up the sticky keys dialog. –  jsgroove Sep 7 '12 at 11:44

3 Answers 3

This sounds like an accessibility issue. I have XP in front of me only, but the answer should be similar for Win7. On XP, go to control panel and select accessibility options.

Under the Keyboard tab you have various options. On my PC, all of them are unchecked.

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I have previously verified the accessibility options and none of them is checked. –  jsgroove Sep 7 '12 at 11:26
    
Can you confirm that within device manager that the keyboard drivers are up to date. –  Dave Sep 7 '12 at 11:27
    
Yes, have also used the device manager to check for driver updates and the system said that the drivers are up to date. –  jsgroove Sep 7 '12 at 11:30
    
I have also did a system restore to 3 days ago but it did not fix the problem. –  jsgroove Sep 7 '12 at 11:30
    
Since this problem started, Windows has also started showing the "USB device not recognized" message from time to time, without me plugging anything in any of the USB ports. The only thing that I have plugged is the mouse which works well. –  jsgroove Sep 7 '12 at 11:33

Stupid but simple: I connected a keyboard, in addition to the one already connected. As soon as Windows completed configuring the new keyboard for use, both keyboards were functioning properly.

My original keyboard now works well even though the additional keyboard has been disconnected.

I am not sure but I think it has something to do with the Human Interface Device Access Service. I tried restarting this service before trying the second keyboard, but it had not helped.

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I had the same problem in virtualised Win7 under Virtualbox. The function keys Control, Alt, Shift (both sides) and Windows key stopped working for no apparent reason.

In my case the keys started working again, when I locked the Win, clicked on "Switch user" and inserted the same credentials of the already logged on user.

It's a bit of a voodoo, but none of the other solutions offered worked for me. (Except for the trick with connecting another keyboard, when I had the same problem some year ago, if I remember well...)

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