I do keep getting a google chrome offer at the top right of my google.com page when i am in internetexplorer. It goes off sometimes, like it went off when i had run combofix first time, came back after i had run second time.If you said no to the offer of Google Chrome when installing Avast,looks like the "hkey_local_machine\software\google\no chrome offer until" is created so you aren't offered Google Chrome again,from all I've gathered.