I have been using Shark codec packs for almost a year now and I am very happy with it, until the latest release.
I always keep it updated, but the after updating to your latest one I found that I have problems playing 1080p files. It will stutters and most of the time stop playing. I have this problem before with the previous version, but it has been fixed several times with the newer versions. But sad to say, the latest version bring back this problem again...
I am using Win 7 (64-Bit) and I always use Shark's suggested settings and choose Dshow DXVA on the H264 TAB, also set MPC-HC for WVC1 on the SWAP TAB, to display the subtitle.