the detection by AVG is False Positive
mchInjDrv.sys[/color]- belongs to a2.
That is part of a technique employed by a-squared
Because of "dynamically " you will not find it in the folder to be able to delete the file.
It is dynamically generated hidden driver, legitimate software use it as a component of the API hooking SDK used to inject a .DLL to other applications.
(unfortunately can be used by malware too)