Can't do anything with AVG

I have the free version of AVG.  It is taking up 20.7GB on my computer.  I cannot uninstall it and I can't update it either.  I have tried doing the usual uninstall and it comes up with a message saying it failed.  I have tried the 'fix it' button and I get a similar message.  I am being told that I'm not covered and I want to fix it by uninstalling AVG and reloading or getting something else, but can't do anything!  I even took it to work and got our IT Techs to have a look and they couldn't do anything either.

Hello Nanette,
I am sorry to hear about this. Please remove AVG traces completely as per the steps mentioned in this article ( http://support.avg.com/SupportArticleView?urlname=How-to-troubleshoot-issues-after-upgrade-to-the-latest-AVG-antivirus-product ).
Then reinstall AVG Free Antivirus by following this article ( http://support.avg.com/SupportArticleView?urlname=Download-and-install-AVG-AntiVirus-Free ).
Keep us informed about the status.