This has only begun happening over last 2 days ( was previously fine )
If the registry editing does not solve your problem, allow me to offer one suggestion................
Do a system restore. Pick a date that is at least 3 or 4 days ago as your restore point.
In case you are not sure how to do system restore ..............
At the search box next to Start button, type
system restore > at the popup box, click
Create a restore point > under System Restore heading, click
System Restore > wait for it to load > click the option to choose another restore point >if you don't have the option to choose another restore point, just click
Next > bottom left, check the box "Show more restore points " > now choose a date when you did not have this problem, click that date > click Next > follow the prompts from then on...............