We’ve received a lot of feedback from folks having trouble upgrading their AVG Antivirus Free Edition from version 8.5 to version 9.0. The following recipe seems to solve the issue:

• Use your browser to navigate to free.avg.com
• Download and save the AVG installation file to your desktop
• Navigate to www.avg.com/download-tools and save the avg-remover tool to your desktop
• Close your browser, go to the control panel, launch Add/Remove Programs (XP) or Programs and Features (Vista, Win 7), and uninstall AVG
• Reboot and run the AVG remover you saved to your desktop
• Reboot and run the AVG installation file you saved to your desktop