cant run boot sector scan as not highling at all please help

please help me i can not run a boot sector scan at all on my computer have everything up and running properly for my avast but still need help any ideas pleaseeeee

Are you talking about scanning at boot time or you cannot scan the boot sector of a disk?
Which OS are you using? Any particular application is running (firewall, spyblocker, proxy, etc.)?

What version of avast do you have? Home or Profesional? :wink: