SOoooo,
Is there anything I can do to keep my computer safe from viruses when I boot other than running a scan manually?
If you really want it, you can put a link for:
"C:\<avast folder>\Ashquick.exe" "*STRT-MEM-SHORT"
into your startup folder for a startup scan of memory, memory blocks and startup files once windows and startup programs have been loaded.
Or you can add a link like this:
"C:\<avast folder>\ashQuick.exe" "*MEMORY" "*STARTUP"
where:
"*MEMORY" memory and memory blocks
"*STARTUP" startup applications and associated files