Open the Control Panel. You can find the Control Panel in the Start menu.
Select the "Keyboard" option. Switch to Icon view by clicking the "View by" link if you can't find it.
Change your repeat settings. You can change how long it takes after holding a key until it starts to repeat, as well as how fast repeat characters appear by using the sliders.
You can test your changes by clicking in the box and then pressing and holding the key.
Change your cursor blink rate. Use the slider at the bottom of the screen to change the speed.
Check your keyboard driver. A faulty driver could be causing issues with your keyboard.
Click the .Hardware tab.
Select your keyboard from the list of devices.
Click .Properties.
Click the .Driver tab.
Click the .Roll Back Driver button.