I’m a big fan of avast free anti virus. I had used avast 4.x for a long time. It had worked perfectly on my vista 64bit until I upgraded it into version 5.0. After the installation completed, I run the avast shortcut then it showed me a notice:
I can’t see the picture just see a red cross in the top left,I guess maybe you come across the same problem as I install the version 5.0. I installed avast 5.0.462 but the program worked abnormally. I tried many times,but the result never changed,so I installed a previous stable version and then upgrate to the latest one,and I succeeded.
Uninstall avast from Control Panel (if possible). If, for any reason, you can’t run it, try booting in Safe Mode and doing it from there. Anyway, boot after that.
Run the avast! Uninstall Utility saved on 1. If, for any reason, you can’t run it, try booting in Safe Mode and doing it from there. Anyway, boot after you’ve run it.
Install avast! using the setup saved on 2. Boot.
Register your free copy or add the license key for Pro.