Do you mean: "Could the Volume Shodow Copy service prevent a hijack from beaing removed?"
Or: "Could the Volume Shodow Copy service alow a hijack to be removed?"
I'm guessing you mean the first one. I really don't have a clue. I would say maybe if you are using the system backup utility. How are you trying to remove the hijack? I would say everyone might as well disable Volume Shadow Copy, unless they need to be able to use the Microsoft Backup Utility.