[ol]- Obtain a new fresh copy of 2014 here: http://www.avast.com/en-us/download-software

  • Use aswclear.exe to remove the other existing version of avast! in Safe Mode.
  • Reboot.[/ol]

See: http://www.avast.com/faq.php?article=AVKB11#artTitle Never run two active a/v’s at the same time on the same system.