Problems with working, uninstalling and installing

Some files in the folders c:\Program Files\AVAST Software\Avast.… *.dll have size equal 0. So avast free antivirus is no working. It is also not possible to install again or uninstall it.

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