I've seen some complaints about this in the avisynth forum, no one seem to have posted anything about a sollution.
They tryied different versions of mpeg2dec(there are a couple more), but without results.
I am using an older version of avisynth, 2.03, because with the latest one I'm getting lots of errors when doing my menues. It works fine just with a script like yours, but when doing the menues, it acts weird.
I don't know if it'll solve the problem, but if you want to try another version, here's where you find it.
http://sourceforge.net/project/showf...group_id=57023
You just have to copy the new dll to your system32 directory.
I really hope it's going to be of help.
Edit
I see different letters for your HD. You have 2?
Can you try opening a file from the same HD with your dll?
And you know, you still need the vobs for the d2v file to work.