Thanks for replying. Please do that and let me know if that fixes the issue.
You can even try creating another User account and check if the symptom appears in the New User account.
You can refer to the URL mentioned for creating a New User account: http://windows.microsoft.com/en-IN/...
Else, If this issue started occurring after doing some recent software changes on your computer, then I would suggest you to restore your system back to a date when it was working fine. System Restore will affect Windows system files, programs, and registry settings only.
For System Restore steps, you can refer to the URL mentioned: http://windows.microsoft.com/en-US/...
Share your comments if it solved your problem.
Thanks & Regards