Well first, be sure that nothing got spilled on the keyboard and that none of the keys are stuck. Then if that isn't the case.
Try this...
1. Uninstall the keyboard driver.
2. Reboot the laptop. (Yes, without reinstalling the driver).
3. The driver should auto install when the computer reloads.
If that doesn't fix the issue, you may want to try starting the computer in "Safe Mode" and see if the problem persists. If it doesn't happen in "Safe Mode" then you have something (virus, bad program, malware, etc.,) on it that is the cause and this would need to be removed.
How to enter "Safe Mode" when booting the computer.
In Windows 8 and 10...
As your computer restarts, press F8 (possibly a few times) to enter "Safe Mode"
a. Press...