Is User Account Control turned on? In Control Panel, type uac in the search box and click "Change User Account Control settings", try ensuring it is set to to the default level. You will need to log out and log back in if you need to change the setting.
If the issue persists, try disabling all non-Microsoft startup items. Start -> Run (or press WinLogo key + R key) and type msconfig. Under Services tab, check the "Hide Microsoft services" box and disable all the remaining items. Disable all items under the Startup tab. Reboot the computer and see if the issue persists. If nothing changes, you can restore your startup items using the same method by checking the boxes instead.
If you're still having the problem, type cmd into the Start menu search, right click the cmd program and choose Run as Administrator. Type
and press Enter. Allow the scan to finish and restart if it finds any problems, see if the issue persists. Is there another user account on the computer you can test? If not, you can try creating another user account and making them an administrator for testing purposes. Hopefully it's a simple fix, if not we can look deeper. I would also recommend running a full virus and malware scan, as some infections can stop UAC from working. You can use ESET Online Scanner and Malwarebytes Antimalware to scan your computer for free.
Edited by ggxtreme, 22 July 2016 - 05:59 PM.