avpi32.dll is a Trojan.Haxdoor-FI. avpi32.dll opens a back door. avpi32.dll tries to terminate antiviral programs installed on a user computer. Related files: %System%\avpi32.dll %System%\avpi64.sys %System%\qz.dll %System%\qz.sys More info: http://www.sophos.com/virusinfo/analyses... Removal: Remove avpi32.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.