Hey now I have problems using Media player classic too
I try to play my mkv and even normal avi files in it and it opens up and give me the "send error report" but instantly vanishes and lingers in my task manager...
Has windows gave an update that has totaby buggered the use of MPC?
I have tried uninstalling, restarting, downloading version 6.4.9.0 and 6.4.9.1 for windows XP and it gives me the same trouble.
Im out of options. What the hell has happened?