Hi Fredrik,

The first thing you should try is touching the bottom edge, left edge, top edge, right edge and at least 3 spots on the top of the space bar.

If it still doesn't work, check that does it only not work in certain applications?
If no, it's probably a hardware issue.
To rule out software, you can reboot into safe mode, and see if it works.

Start your computer in safe mode and check if the issue appears there as well. If it does not appear in safe mode place the computer in clean boot state to identify the culprit program running in the background creating this error.
Safe mode is a diagnostic mode that starts your computer in a limited state. Only the basic files and drivers necessary to run Windows are started. The words Safe Mode appear in the corners of your monitor to identify which Windows mode you’re using.

1. First use your finger to make a sliding motion from bottom to top on the illuminated screen in Modern UI, then click once All Applications. If you are using a mouse, please right click once All Applications.
2. Then on the command prompt character use your finger to slide from top to bottom, and click once more Executable by system administrator. If you are using a mouse, click on the command prompt character and right click, then click once more Executable by system administrator.
3. Click to input Bcdedit /set {bootmgr} displaybootmenu yes,when completed press the Enter key on the keyboard. If you need to cancel the prompt to enter options at startup, simply change Yes to No.
4. Once completed, please restart your computer, then press F8 to enter setup screen upon startup, then press F4 to enter safemode.
5. If the problem does not exist in safe mode, try to perform a clean boot and check.

For Num Lock, By default, the numeric keypad is always On, allowing for number input only. In some situations, the numeric keypad is inadvertently turned Off. If the numeric keypad gets turned off, you can use the Windows On-Screen Keyboard to turn it back on.

To enable Number Lock with the On-Screen Keyboard:

1. Click Start, type on-screen in the search field, then select On-Screen Keyboard from the search results list.
2. When the On-Screen Keyboard displays, click Options.
   
3. In the Options window, select Turn on numeric keypad , then click the OK button to save the change.
   
4. The On-Screen Keyboard now displays a numeric keypad. Click NumLock to enable the numeric keypad on your HP Envy series notebook.
   
5. Close the On-Screen Keyboard.

I hope this helps in fixing this virtual keyboard issue.

Regards,
Lokesh