Hello and welcome to the forums:
I would suggest that first you run a full AV on your computer..
Download and run a full scan from malwarebytes...
This way you will rule out any virus etc.
I would boot into safe mode to see if you have the same problem there, here's how.. Safe Mode
I also would do a sfc scan, here is the info you will need it is very easy. After you run the full sfc if it finds any problems then run the sfc 3 times. System Files - SFC Command
You can also look in the Event Viewer and find the logs so you can see what's going on, but before we get there please follow the things above first.