Quote:
"Update of AVG 7.1 to 7.5:
1. Run the AVG Free Edition 7.5 Setup program
2. Click "Next >" on the AVG "Welcome!" screen
3. Click "Accept" on the "License Agreement on Use of an AVG Free Edition" screen
4.
Select "Repair installation" on the "Select Setup Type" screen and click "Next >"
5. Select "Restart the computer now" (pre-selected by the program automatically) and click "OK" on the "Installation Complete!" screen to restart your computer and complete the installation"
Source:
http://free.grisoft.com/doc/5390/lng/us/tpl/v5 #avg-anti-virus-free
If the installation doesn't work, trying uninstalling 7.1 first.
If it still doesn't work, the download must be corrupt. Re-download the set-up file.
Chris