Avast Premier Installation error

Avast Free Antivirus / Premium Security
1

Hi,
I was using Avast Free internet protection and bought the Avast Premier and tried installing and running the license file. An error pops up : ‘Unable to insert the license file. The AAVM subsystem detected a RPC error.’

pls help

2
  • OS…?? (32/64 Bit…? - which SP…?)
  • Other security related software installed…??
  • Which AV did you use before avast!..??