No go, it didn't work, I still got the same problem. Said "Video: Stream attributes could not be determined."

I was looking around at another forum who suggested using AviSynth to change some script. I tried it, but it only worked with like 1 out of 4 files (kept getting errors) that I tried it on. But then when I tried to use the newly scripted file in the Vegas (like the instructions said) it was unable to read the file at all. Does anyone have any exprience with AviSynth, or maybe could suggest something else?