Avast - Won't install?

I have been trying to install Avast free home edition umpteen times today. I have gone through the installation process, reboot like it asks me to and when my laptop is up again there’s no Avast. Not on the desktop, nor in the list add/remove programs. So what’s happening here? Have any advice?

Is there a way to upload a screen shot?

  • OS…?? (32/64 Bit…? - which SP…?)
  • Other security related software installed…??
  • Which AV did you use before avast!..??