Go into the Upgrade folder in the BuildOS folder that was extracted (C:\BuildOS\Upgrade by default), and go into the RUU folder that you are using to flash your phone. (Standard, x.04+, noID) Inside the folder there should be the upgrade utility, right click on it and go to properties. Under properties, select launch as administrator and say ok, then try to flash your phone again. It should work this time.
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