It's not a general call to delete xml files. It is the xml file that you find in the root of the C drive or your boot drive. There is no good reason for this file to reside here other than to reinstall the adware that you just deleted.
Pandora is right, random deletion of xml files can cause havoc with your system. However, you won't see a valid .xml file in the root of the boot drive.
Okay, there is one exception. That's the one where all your applications are installed wild on the C drive and not in their preassigned and designated directories. If you have done this then you need to do it all over anyway.