what is the probability that users have installed the problem (google Print parts and pieces), or the "filter" or interception that gets installed with that software is still active, even if the program itself doesnt show as installed, or actually has been uninstalled.
this type of thing has occured more than once with "filter" type items. ranging from AV hooks that still exist, to filters stuck in drivers that (IMO) shouldnt have been there using that method to begin with.