Unpacking Error

Ok, so, I patched Medieval II to v1.1 and tried to run the unpack_all.bat.

When doing so it came up with an error. Something along the lines:
'The procedure entry point MiniDumpWriteDump could not be located in the dynamic link library dbghelp.dll.'

I would post a pic but I'm running it off another computer and my flash memory stick thing is playing up and damages any copies I put on it so just use your imagination. ^_^
Anyway, is there anyone who knows what's going on or how to fix it? Or someone else that got this error? Thanks for any help.