If you check your GPOs, is Always wait for the network at computer startup" value. Enabled or disabled?
Try change this to enabled and report back.

Have you turned off UAC?
You can find the settings here: C:\Windows\System32\UserAccountControlSettings.exe
Try to set it to default and restart your computer, also make sure your not using the...

I know the error message not telling you that you have insufficient permission.
But it's worth a try..
https://support.microsoft.com/en-us/kb/2249906

You can make a quick test by giving the user...