Maybe, but I have Pest Patrol and the only entry in C:\Program Files\Common Files\Scanner is ppctl.dll but my version of PP is Version 4.
Navigate to the file and right click it. On the bottom of the menu that pops up is the item "Properties". Select this and navigate to the Version tab and see who the author of the program is.
Interestingly though, my version of Pest Patrol is 4.4.4 but the version number of ppctl.dll is 184.108.40.206. Now I'm really confused!