I read all the information that you have supplied, again. It appears to me that we can solve your problem. It really is not that difficult, but it involves the registry. This area, always makes me concerned. Get back to me after you save the current registry settings:run>regedit>export. Export to some external device.
As a safeguard, also, make a system image.
In the event that Murphy's Law is invoked we can return to our starting point.