program modification: sometimes, not only virus trojandownloader:win32/delf.fs or malware disk doctors data sanitizer but also common softwares possessing the ability to modify the inner functions of wowreg32.exe, which means other programs can't find this dll file again.

Make this proper case.
Program Modification: Sometimes, not only virus TrojanDownloader:Win32/Delf.FS or malware Disk Doctors Data Sanitizer but also common softwares possessing the ability to modify the inner functions of wowreg32.exe, which means other programs can't find this DLL file again.