UAC is User Account Center -
open search --> settings --> type UAC and enter make sure it is set to DEFAULT.
there are 4 settings, and the 1st down from top is darker than the others... that is default.
OK if default, then it might be a bad install (windows 10 is known to do that)
1. you can do a offline upgrade and see if that fixes. insert the Windows 10 media and select upgrade.
2. MS also offers a MediaCreationTool to DL and make the latest windows 10 on USB or DVD
my link = https://mega.nz/#!dtMWhAhT!bRVsI4wzmhMPRNPXW5bGW-AVvKUCbYA9gncHcI81ZSE
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