Chances are that the CRC error is the result of copy protection on the disk that shrink can't handle alone, so it's going to need a little help. So if you want to get it done the FREE way, follow along:
Download and install a free ripper/decrypter called DVDFab decrypter, use DVDFab to rip the video files to your HDD.
Once DVDFab decrypter is done, you'll have a VIDEO_TS folder on your hard drive containing the files it ripped. These files will need to be processed thru vobblanker to remove fake cells and correct file structure so shrink can open the files and process them correctly.
Unzip the file and run the executable, it will look a bit like this:
For input folder selection: browse to where the VIDEO_TS folder created by DVDFab decrypter is located, inside the folder, look for the VIDEO_TS.IFO file and choose it.
The path might look something like this:
c:\Movie folder\VIDEO_TS\VIDEO_TS.IFO
Note: When importing the VIDEO_TS.IFO file, if you notice that vobblanker has marked a video title set (VTS) in the top half as skipped, click on the Proc.All button on the right to ensure all video title sets are processed.
For output folder selection: create a new folder on your desktop and call it "MOVIE", inside that folder create a new folder and call it "VIDEO_TS "(this is where you'll have vobblanker put the output files it will create)
Once the folders have been created, have the output folder selection point to the VIDEO_TS folder in the MOVIE folder.
The path for output folder might look something like this:
c:\documents and settings\johnl123\desktop\MOVIE\VIDEO_TS
Now just press the PROCESS button on the bottom and wait until it's done. Once the process is complete, there should be a new set of video files that vobblanker created in the VIDEO_TS folder that's in the MOVIE folder on your desktop.
At this point run DVDshrink and open the files, click on the "open files" tab and browse to where the VIDEO_TS folder is that's in the MOVIE folder on your desktop and choose it. Shrink will import the files now correctly with no errors, at this point you can use shrink as you normally would to create a backup. Have shrink reauthor the DVD to backup just the main movie and 5.1 eng audio channel, have shrink create an ISO image and burn it to disk using DVD decrypter.