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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