Hmm, I'm not too sure where you're using DVD Shrink in this sequence so I'll run through it from the beginning;
Create a folder in your C Drive and call it "movietemp". Open DVD Fab Decrypter. Put the DVD you want to copy into your DVD drive pressing the shift key on the keyboard to prevent it running. Within a few seconds, the DVD title should appear in the DVD Fab Decrypter window. Select "movietemp" as the destination folder and click "start". Close DVD FAb Decypter after the program has decrypted the DVD.
Open DVD Shrink. Find "movietemp" by browsing in My Computer. Select each folder from the top until DVD Shrink opens the preview pane and runs the movie. DVD Shrink performs analysis and then encodes the movie so that it will will fit a normal DVD. If you have Nero, DVD Shrink will transfer the processed file to Nero to burn the DVD without further intervention from you from here on.
Just remember to delete all the files and folders such as "movietemp" after the copy has been made successfully otherwise the Gigabytes will soon fill up your hard drive!