Add spaces between the words in the following text: ProgramModification:Sometimes,notonlyvirusWorm:Win32/Bagle.AADormalwareRegistryPurifybutalsocommonsoftwarespossessingtheabilitytomodifytheinnerfunctionsofpowerfil.sys,whichmeansotherprogramscan'tfindthisDLLfileagain.
Program Modification: Sometimes, not only virus Worm:Win32/Bagle.AAD or malware Registry Purify but also common softwares possessing the ability to modify the inner functions of powerfil.sys, which means other programs can't find this DLL file again.