Avast won't open.

I click Avast to open it, and My cursor as the loading thing on it but then after like 3 seconds after, It’s back to normal and that’s it. Avast doesn’t open. I restarted My computer, Tried to repair it (the repair option wasn’t even there!) and still. I try and scan items, and it does the same thing but crashes my file explorer. Help!

  • Which Avast…? (Free/Pro/IS/Premier)
  • Which version…?
  • OS…? (32/64 Bit…? - which SP/Build…?)
  • Other security related software installed…?
  • Which AV(s) did you use before Avast…?