Avast installation stops computer working properly

When I install my licenced version of Avast Internet Security it causes problems with the Windows 10 start menu and other software preventing things from loading. If I uninstall avast everything returns to normal. Why does this happen and what can be done about it?

Trevor

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