DavidR
3
Not necessarily as the screensaver scan is fully customisable and can be set to also do a full anti-rootkit scan amongst other things (see image). Not to mention you can run it in normal windows mode, plus you can configure other areas.
However, anti-rootkit scanning is done automatically 8 minutes after boot and is also incorporated into the Quick (super quick rootkit scan)and Full System scan (quick rootkit scan), so they are covered. Or you can create a custom scan and have a Full rootkit scan incorporated into it. So there really should be no need to run a boot-time scan just to get a rootkit scan done.