Try to boot your system into Safe mode:
Restart your computer if it is powered on.
Press and hold F8 key for 3 seconds after your computer initially powers on.
Once you see theAdvanced Boot Options menu (or hear a beep) you can stop.
Use the up/down arrow keys to highlight your selection.
Select Safe Mode with Networking and press Enter
You should see drivers loading, this may take a few moments
You should then be at the Welcome Screen
Logon to your computer using an account with Administrator privileges. Now you should download (free) MalwareBytes install, update then do a scan of your system in safe mode, to make sure it is indeed clean! Once the scan is done delete anything it finds.
Then simply reboot your PC to see if your issue has been resolved!