kindly read this post: Avast Scheduled scan
No no, actually that thread is completely unrelated - it doesn't talk about the BOOT TIME scan elitedude was asking about...
To schedule the boot-time scan (even in the Home Edition), just start avast, go to the menu (e.g. by right-clicking anywhere on the blue panel) and select 'Schedule boot-time scan'... Quite easy, isnt it?
Vlk