If this is a recent issue, do a system restore. Pick a date when you did not have this problem as your restore point.
You will need to access system restore option BEFORE you sign in.
Restart computer but do not sign in.
At the login screen, bottom right, there should be 3 icons........
Networking, Ease of Access and Power.
Left click at Power icon will give you a Restart option. Yes ?
Press the SHIFT key and HOLD it > click Power icon and select Restart > release hold.
If asked, click Restart anyway > wait > click Troubleshoot >click Advanced options > System Restore is on the list.
Please post back the result.