Unable to read VOB File

Hello, I have a home movie On Dvd that I recorded from old VHS Tape. I tried to copy all files from the DVD to the hard drive and received a "Can't read the source file". This is the last file vts_01_4 VOB. All the previous files copied o.k. no problem. I Also backed up other Home Movies On DVD to hard drive without a Problem. The Movie is 3.77 Gigs on a single layer disk on a memorex dvd+r. The file is 723 MB. I did write on top of the disk with a sharpie and thiking that may have something to do with it. The Program I used to create the movie was nero 10. I am now using Power Director 9. I can play the movie on Windows media player and it works just fine. I spent a lot of time editing the movie so I would like to get this file copied so I won't have to do it again. Thanks.

Windows 7 64 bit