where is the boot time scan in the new version 8
Try this:
Open Avast-Security-Antivirus-Scan Now-and select Boot Time scan-Schedule Now and choose best settings for you-Restart PC.
Why do you feel the need to run a boot scan?
Did you run a scan and did avast advise you to run a boot scan?
The only reason to run a boot scan is if avast advises you to do so.
I can’t remember the last time avast recommended that I should run a boot scan. 
i just move entire contents to new sata drive. i would do a boot scan once every 3 months. want to start the drive out absolutely clean.
by the way…
avast
security
scan now NO BOOT TIME SCAN OPTION
found Boot-time scan at bottom or scroll bar… All Scanned zero infected files
thanks for your paitience
No problem. I just didn’t understand the justification for doing a boot scan.
Glad you found it.
I run the registered Pro Version of Avast along with the Pro Malwarebytes and recently ran a complete scan with both and found nothing. When I ran a bootscan, Avast found 42 Rootkits and Trojans and deleted them. I’m a believer in at least Monthly boot scans.
post a log or screenshot of the scan result so we can see what was detected…
I’m a little puzzled??? Once a boot scan has been run, avast! has checked all the files that are possible to be checked.
Thereafter, anything added or changed is automatically checked.
Why run a boot scan weekly ??? Does it make you feel better ???
Your computer, your choice.
I for one have better things to do than wait for scans to complete.
I wanna know to to skip the boot time scan screen… Cos I keep hitting a wall… And my PC never starts up. It keeps saying “registry error” and hen it repeats itself again.
Please help me
Post here https://forum.avast.com/index.php?board=4.0
Follow these instructions to the letter https://forum.avast.com/index.php?topic=53253.msg451454#msg451454