Fra http://www.grisoft.com/doc/59/us/crp/0
: faqshow(497)'>How to download and install AVG products
When you are prompted, please do not open this file directly from the internet, but click "Save" button and choose location where installation file should be stored. We recommend saving the file to the Desktop.
Reboot your computer.
Locate the downloaded AVG installation file (it has a four color square icon and its name starts with AVG75...) and launch the installation by double-clicking on it.
Follow the installation wizard.
Enter your license number when you are asked (we recommend that you use copy&paste method to enter this license number into the installation form).
If AVG asks you for a computer restart, please do so.If there is any problem installing AVG, our technical support need to get the AVG installation log file to find out why AVG cannot be correctly installed on your computer.
To send us the file, please do the following:
Click Start -> Run, type %tmp% and press OK button. Please find a file called "avg7inst.log" in the Explorer's window that will appear on the screen and send it to our technical support