Do NOT install codec packs like KLite and Shark007. These packs install the codecs using registry and others hacks that can permanently damage the windows setup.
If you’ve installed these codec packs and try to use WMP, WMC or any products that use Windows Media Foundation, they may cause a CRASH. These codec packs can destabilize and cause Windows media foundation to malfunction.
The only SAFE codec pack that we have tested (that appears to plays by Windows rules) is LAVFilters. It plays well with Windows and can have a clean uninstall if required.
You can downloads LAVFilters from:
Releases · Nevcairiel/LAVFilters · GitHub
If you happen to have installed KLite or Shark007, try to uninstall them (it can be very difficult to undo some changes made by these packs which can cause permanent damage to the windows setup). If it does not work, use this tool to try and repair/reset the default Windows Media Foundation settings and disable the codec packs.
Codec Guide: Windows 7 Preferred DirectShow Filter Tweak Tool
If that does not work, reinstall Windows. MCEBuddy is not related with these crashes, the mp4, wtv, mkv files are ALL FINE, codec packs and graphics drivers are responsible for crashes.