Uninstall AVG Internet Security failed

After your senior technician's work, it seems able to install the anti-virus FREE, but I still failed a Internet Security offline installation. The following is the screenshot.
User-added image
same as I provided before.

Hello Yaqing,
I understand how something like this can really try your patience.
Could you please let us know the exact error message and error code you receive when you try to uninstall AVG Internet Security? also provide us the screenshot http://avgclick.me/getscreenshot of the issue, so that we are more happy to assist you better.|
Please feel free to contact us for any further assistance. Thank you.

I have no idea why my Internet Security suit turned An Antivirus FREE, and I cannot suspend the protection temporarily. When I was trying to uninstall the product, it seems failed, so I tried to restart my computer. However I didn't get any prompt to stop me from restarting the computer. 
 
When I boot into my system again, and try to install the Internet Security again, I got a 'Event execu_finished' error. I tried AVG Remover, AVG IDP Uninstaller, and install again with a offline installer, it seems sth. is still there. I got a Error Code:0xC0070643, driver not installing failed(0x80010299).
 
What can I do now to fix this?

Hello Yaqing.
Thank you for getting back to us. We would request you to follow the steps in the email that I have sent you earlier to get in touch with one of our expert technician to resolve your issue. Thank you.

After your senior technician's work, it seems able to install the anti-virus FREE, but I still failed a Internet Security offline installation. The following is the screenshot.
User-added image
same as I provided before.