MajorX I tried your file with Nikse555's latest version here:
http://www.nikse.dk/SubtitleEdit.zip
I also got lots of symbols if I had "Try MS MODI OCR for unknown words" unchecked.
but if you use the MS MODI OCR it detects all of them just fine
give it a shot.
PS: I wonder if that subtitle file has ever had its resolution resized.... the letters are really bad quality.