Make sure that the NumLock key is enabled. If pressing the key once doesn’t enable NumLock, press and hold the key for five seconds.

Verify that the correct keyboard layout is selected in Windows Settings and that the layout matches your keyboard.

• Try enabling and disabling other toggle keys such as Caps Lock, Scroll Lock, and Insert while checking if the number keys work on different apps or programs.
• Disable Turn on Mouse Keys:

1. Open the Ease of Access Center — click the Start key, then click Control Panel > Ease of Access and then Ease of Access Center.
2. Click Make the mouse easier to use.
3. Under Control the mouse with the keyboard, uncheck Turn on Mouse Keys.

• Disable Sticky Keys, Toggle Keys & Filter Keys:

1. Open the Ease of Access Center — click the Start key, then click Control Panel > Ease of Access and then Ease of Access Center.
2. Click Make the keyboard easier to use.
3. Under Make it easier to type, make sure all checkboxes are unchecked.

• Verify the product or receiver is connected directly to the computer and not to a hub, extender, switch, or something similar.
• Make sure the keyboard drivers are updated. Click here to learn how to do this in Windows.
• Try using the device with a new or different user profile.
• Test to see if the mouse/keyboard or receiver works on a different computer.