Hi Stokely welcome to the Forum
1 Which Avast did you download? AIS, Avast free, or Avast Pro?
2 Are you on XP Vista or Win7? which OS?
3 What security software are you using alongside Avast? Including firewall, anti spyware etc.
4 what was your previous antivirus?
5 Do you have Malwarebytes on demand scanner installed?