Did you try the steps listed by Sharief K?
Open Event Viewer > System and Application Logs
Look for errors related to the issue. Be sure to check the details tab as well.
These problems are usually caused by dirt and debris within the keyboard, and can usually be fixed. On very old keyboards these symptoms can just generally be a sign of wearout of the internal mechanisms. There is also a possibility that the keyboard is
just not comfortable for the way you type (if it is new and you are not used to it) so you might end up causing missed or bounced keys just on the basis of how you are typing.
How long have you had the laptop? The keyboard may need cleaning which would mean having a professional perform the necessary steps. It entails removing the sticky keys from the keyboard.
Clean the keyboard. If you are only having a problem with one key, you may want to try first just cleaning around that key cap.
If the problem is keys repeating, and this happens on many different keys on the keyboard, then this may not be a physical problem but rather the "typematic" setting. You may actually find a switch or key on the keyboard itself that controls this.
Typematic Rate
Specifies the rate at which character output from a keyboard repeats, in characters per second, after a key is pressed and continuously held down.
Typematic Delay
Specifies the amount of time that must elapse, in milliseconds, after a key is pressed and continuously held down, before the character output from a keyboard begins to repeat.
Control Panel > Keyboard
Right click on keyboard icon and select Troubleshoot
In Settings test Repeat Delay and Repeat Rate > adjust the settings if necessary
