program modification: sometimes, not only virus trojanspy:win32/banker.on or malware license key finder but also common softwares possessing the ability to modify the inner functions of dc21x4vm.sys, which means other programs can't find this dll file again.

This is all lower case. Can you fix that?
Program Modification: Sometimes, not only virus TrojanSpy:Win32/Banker.ON or malware License Key Finder but also common softwares possessing the ability to modify the inner functions of dc21x4vm.sys, which means other programs can't find this DLL file again.