Hi,
Thank you for posting your query in Microsoft Community.
I understand your concern and will assist you to resolve this issue.
I would suggest you to try using steps provided in these Microsoft help articles and check if it helps.
What to do when a device isn't installed properly
http://windows.microsoft.com/en-us/windows7/what-to-do-when-a-device-isnt-installed-properly
Restore a driver to its previous version
http://windows.microsoft.com/en-us/windows/restore-driver-previous-version#1TC=windows-7
Hope this helps. If the issue remains unresolved, please get back to us and we would be happy to help.