AVG Driver Updater (AVG D.U.)

Other user Andrew Moore posting (https://support.avg.com/answers?id=9060N0000000UMPQA2).
AVG Guru
Just purchased AVG D. U. but when tried to install message received: The subject is not trusted for specific action. Press OK
The new message reads: AVG D.U. Setup Wizard ended prematurely because of an error. Your system has not been modified. To install AVG D.U. at a later time, run SetUp Wizard again. Click the Finish Button to exit the Setup. Okay so what does all this mean?? Andrew  

Other user Andrew Moore posting (https://support.avg.com/answers?id=9060N0000000UMPQA2).
AVG Guru