thanks your reply... the software name "AVG Anti Virus", and the version is "7.1". the version of dll file of that software is 7.0.0.238, got many type of dll file, all are not the same, all the version of the dll file at .last three digit is diffirent... example=7.0.0.312, 7.0.0.347, 7.0.0.349....etc