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Windows 7: Keyboard error - mixed buttons? Can't login or boot

30 May 2014   #1

Windows 7 64 bit
Keyboard error - mixed buttons? Can't login or boot

Hi! I have pretty much similar problem than described in this thread,
Only backspace works on startup
except that I can't press F8 to open boot screen.
I only could get in the boot screen when I cold restarted, but my keyboard "don't recognize" any buttons, so windows will start normally to prompt a password.
I tried to use boot using my windows installation cd, but I can't "press any key to boot from cd/dvd..."

What could be causing this? I had another problem like this(none of the keys worked) before this, but I was able to log in using "visual keyboard-function". I re-installed drivers, solved problem.
Now I can't use visual keyboard at all

To add
-Both times, there was an security update (avast, malwarebytes) before the malfunction.
-I tried two keyboards, and several USB ports.

Is there anyway to boot my pc? Any help would be appreciated

My System SpecsSystem Spec
30 May 2014   #2

Windows 10 Pro

You tried two different keyboards and none worked?

As well as multiple usb ports?

Does your computer have a ps2 connector, the non usb connection for keyboards? Maybe you could find a old ps2 keyboard if your ps has the connection and use that...

Tried resetting bios defaults?

Here is a whole guide if you do get the keyboard to work:

Please read this tutorial fully, and follow all steps.

99% of the time all issues can be resolved with problems starting windows with this tutorial.

Troubleshooting Windows 7 Failure to Boot
My System SpecsSystem Spec

 Keyboard error - mixed buttons? Can't login or boot

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