Unscheduling Boot-Time Scan?

When the program is 1st installed, you are asked if you want to run a scan on boot-up, if you selected this … and now don’t want to wait 15 mins - how do you unschedule this boot scan?

OS: XP Pro, Avast 4.5 Free Home

You don’t have to it is a one of task, which should you need it in the future you schedule it for the next boot.