|Why were you trying to install AVG version 9 ? |
As far as I know it's no longer being supported by AVG. The current version is AVG 2011.
Un-install AVG 9 in Control Panel - Classic view - Add or Remove Programs and get AVG 2011 and install that instead. There is a free version if you want that rather than the paid version.
If you can't un-install AVG 9 because using it's own un-install produces some error....
AVG 8.x+9.x Uninstall / Re-Install Instructions
NOTE that the AVGremover program MAY seem like it has stalled, but it probably hasn't - give it at least 5 minutes to complete.