CoreAVC Professional on Windows 7

I use CoreAVC + Haali + Media Player Classic in Windows 7 x64 without any problems. There is probably another codec that is taking priority over CoreAVC. If you have ffdshow insalled, go into the options an set h264 support to disabled. Media Player Classic also has options to set codec priority.

I read somewhere that if you have MPC HC 64Bits installed, you need a 64 Bits decoder, which CORE AVC isn't on the moment