Please download and run the avg removal tool from this page, click on the correct 32 or 64 bit version for the operating system you have.
http://www.avg.com/us-en/download-tools
Then please download the full offline install of AVG free here.
http://free.avg.com/us-en/download-file-ins-afe
or here.
http://www.softpedia.com/get/Antivirus/AVG-Free-Edition.shtml
yes,
run the avg removal tool from the official site of AVG.
For more information, you might refer this site