AVG Ultimate installation problems

Duncan, Also have a look @ this AVG article (https://support.avg.com/SupportArticleView?l=en&urlName=How-to-find-out-if-you-have-32-bit-or-64-bit-operating-system).
AVG Guru

Duncan, Also have a look @ this AVG article (https://support.avg.com/SupportArticleView?l=en&urlName=How-to-find-out-if-you-have-32-bit-or-64-bit-operating-system).
AVG Guru

Purchased the Ultimate package and followed the installation instructions on the email from AVG. The installation progress bar reached 78% fairly quickly and then hung for hours before eventually aborting. I've got an old AVG Internet Security program in my Control Panel list which refuses to uninstall - and I suspect that this may part of the problem. I've tried every possible fix using the various removal tools on the support forum but none have worked. If I can't get this sorted then I would like my money back under the 30 day promise. However, I can't find any information on the AVG website on how to do this. A promise is a promise after all. Any way of sorting this out?