Question Is there a way to fix the issue of keyboard repeating letters in Windows ?

And this happens with the internal keyboard as well?
Detach the laptop's internal keyboard
I don't use the internal keyboard because I disconnected it a while ago

I have been using an external keyboard for two years, and a few days ago I had a problem with repeating letters

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Can you log in to your device via AnyDesk remote control software to find out where the problem is?😔
No. Sorry.

Try scanning with Malwarebytes or Hitman Pro.

Multiple keyboards having this issue implies a OS issue.

Another interesting experiment would be to boot the system from a Live Linux distro to see if the problem continues. If so, that verifies as a hardware problem.
 
I want Malwarebytes or Hitman Pro. With activation
No. Sorry.

Try scanning with Malwarebytes or Hitman Pro.

Multiple keyboards having this issue implies a OS issue.

Another interesting experiment would be to boot the system from a Live Linux distro to see if the problem continues. If so, that verifies as a hardware problem.

No. Sorry.

Try scanning with Malwarebytes or Hitman Pro.

Multiple keyboards having this issue implies a OS issue.

Another interesting experiment would be to boot the system from a Live Linux distro to see if the problem continues. If so, that verifies as a hardware problem.
Is it worth trying the Live Linux distribution via VirtualBox to see if the problem persists?
Or should I install basic Linux?
 
I think yes, when I disconnected the internal computer, something small fell out
That confirms a hardware issue then. Has anything fallen into the laptop? Any foreign object or liquids?

That confirms a hardware issue then. Has anything fallen into the laptop? Any foreign object or liquids?
I think yes, when I disconnected the internal computer, something small fell out

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Since the problem occurs under both Windows and Linux, you have an unknown hardware issue. I am at a loss for anything other suggestions.

It would be interesting to see how a wireless keyboard would perform, either Bluetooth or with a wireless dongle.