Hi,
Wow that’s great that you have performed some steps before posting in this forum.
It’s disheartening to know that things are not working as they were before.
The issue could have happened due to some third party software conflicts.
Place the computer in clean boot and check if it helps.
To help troubleshoot error messages and other issues, you can start Windows 8.1 by using a minimal set of drivers and startup programs. This kind of startup is known as a "clean boot." A clean boot helps eliminate software conflicts.
**How to perform a clean boot in Windows**
Note: Check the title “How to reset the computer to start as usual after clean boot troubleshooting” for reverting to normal mode.
If you need any further assistance with Windows Operating System, please post your query on Microsoft Community Forums and we’ll be glad to assist you with it.