PP.exe is a dangerous executable file, which is installed and used by lots of malwares. It is closely related to PC Privacy Defender, AntiMalwareSuite, AntiSpywareGuard, AvCare, SpywareRemover 2009 and lots of other potentially unwanted programs. Once installed on the system, pp.exe is typically used for different tasks: it has ability to start a parasite, launch some of its components, update it or delete some of its components. Once executed, PP.exe file can also work on collecting sensitive user's information and then use it for future crimes.
If you noticed PP.exe running in your PC system, you should never leave this file there! You should remove this file ASAP. For checking the trustworthiness of PP.exe, we recommend using RegCure Pro. Don't forget that it can be related to various malwares, so after terminating this process you should also scan your computer with Reimage and get rid of all malicious files.