Balious, mdmp files are minidump files, generated following a crash.
This is from Windows:
"Uncompressed error dump file generated by Windows XP/Vista when a program has an error or crashes; contains a "dump" of the program state when the error happened and other relevant system data recorded at the time of the error.
Compressed Heap Dump files are saved as Minidump (.MDMP) files and may be sent to Microsoft as part of an error reporting and bug fixing process.
Windows Error Reporting settings are stored in the Windows Registry at "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Windows Error Reporting."
You may still have a problem with graphics department there. I wouldn't suspect from the memory, though still may have a part in it, but seems that the main culprit graphics (quite probably the graphics driver, or GPU coding has a fault in it that may be accelerating an existent difficult read problem on the processed files. You previously referred to textures and that when you removed them, the game started (if I remember right.) That may be a supporting evidence on this assumption. Try that again if you wish. See any change in response.