<unknown> startup information for Windows XP, Windows Vista and other versions of Microsoft Windows
Added by the Troj/RKProc-Fam rootkit. More info here.
This page helps identify spyware, viruses, and other programs that you don't understand what they are, or want to know if ppdriver.sys is a safe file or if you can safely remove or delete ppdriver.sys. Use at your own risk and if unsure either do a virus/anti adware scan and seek advice from a professional adware remover