I downloaded and installed AVG Free 2014 and it performed a first-time optimization scan. Here is the result (copied to a text file): Does anyone know what these IRP hooks are? The file is the one of SP3, version 5.1.2600.5512, size 574,976 bytes, CRC32 for data 84B0A6F3 (by 7-zip). I performed a shell extension scan and a command line single file scan (with avgscanx.exe) afterwards that showed no infection.