Hardware acceleration not working with .mkv files with subtitles

Hi,
I have Gforce 8800gt, PowerDVD 8 Ultra, WindowsXP.
I have forced my MPC to use Cyberlink 264 decoder, and when i playback a 1080p file i get %1-2 CPU usage so everything is working fine.
But when a .mkv file has subtitles in it i cant get GPU acceleration to work.

So from what i see in Graphedit, when a .mkv file has subtitles the video goes to "Cyberlink 264" first then to DirectVobSub.
When i disable DirectVobSub i get no video,
when i use another subtitle filter i get no video
when i use a .mkv editer like AVI-Mux and remove the subtitles from the .mkv file i still get no video and a subtitle filter still tries to load even though the .mkv file has no subtitles in it.
I did download EVR for MPC classic, set it to use it but still no luck.
No luck with MPC Home Cinema, VLC and Bsplayer either. I either get no video or when i get video the GPU acceleration is not working on any x264 file wheter it is 720p or 1080p as long as it has subtitles in it.

Any solution for this?

I had searched and did another set of search again but nothing.

Your method is not working either. I blocked both DirectVobSub's in external filters and turned on subtitles in MPC-HC but i get no video. I tried different settings in Output settings keeping external filters setup above but i get no playback and sometimes just sound no video. The only thing that works is using Overlay Mixer, it plays fine but no hardware acceleration.

Uninstalled vsfilter completely, tried different settings in MPC-HC with no luck. I think i am gonna focus on removing subtitle files from .mkv packs properly and see if it works.