Amir, Try removing AVG by downloading & using the 32 or 64bit 2015 Remover (http://www.avg.com/ww-en/utilities) [Scroll Down], whichever suits your system. If you're not sure about 32 or 64 bit on your system have a look @ this link (http://support.microsoft.com/en-us/kb/827218).
AVG Guru
Hi, I have been using AVG for the last 5-6 years without any issues and it has always worked very well for me. Last month I upgarded to Windows 10 and after that somehow I started receiving messages that my AVG protection is about to expire. When all protection expired I searched the internet to somehow downgrade to the free version. While downgrading to free version, it stopped uninstalling and gave me error code 0xC0070643… unable to uninstall. I tried many times but to no avail. I also tried to reinstall the same version, but did not help. Then I went to other web forums and tried to download a new version of AVG ZEN; that did not install as well so now I cant install or uninstall AVG from my laptop. Can someone kindly help in this regard please.
Amir, Try removing AVG by downloading & using the 32 or 64bit 2015 Remover (http://www.avg.com/ww-en/utilities) [Scroll Down], whichever suits your system. If you're not sure about 32 or 64 bit on your system have a look @ this link (http://support.microsoft.com/en-us/kb/827218).
AVG Guru