User passwords changed after restart

Hello Les,
Please be informed that the AVG program will never conflict with the functionalities of the Windows OS. Please try to reboot your PC in safe mode using the instructions on the article : http://avgclick.me/rebootintosafemode and check whether you could login into your PC. If you are still facing any issues we request you to contact Microsoft support so that they could analyze the issue for you.
Thank you.

Hi all. I installed a free AVG virus removal, then paid for an upgrade (23 pounds, down from 30 I think).  After the asked for restart, the computer does not recognise my start-up password. Effectively, I'm locked out.  Help with a big H. Ta.

Hello Les,
Please be informed that the AVG program will never conflict with the functionalities of the Windows OS. Please try to reboot your PC in safe mode using the instructions on the article : http://avgclick.me/rebootintosafemode and check whether you could login into your PC. If you are still facing any issues we request you to contact Microsoft support so that they could analyze the issue for you.
Thank you.