DVD burning help ??? Really desperate to get it right just now...?

OK im trying to make a hard copy of a few of my favourite DVD. Since theyre copy protected and are too big to fit on a disc ive been using dvd shrink to make them smaller and to miss the protection. I encode the disc and save the files to my computer. I then go in to my computer, go to where i saved the dvd files then click "burn to disk" I burn the files to the disk and it seems to have worked ok but when i play it on my dvd player it says "error on disk" whats going wrong and how do i fix it ? Is there a better software ? Im using windows vista. any help will be greatly appreciated. Ive been trying to do this all day with no luck and ive almost had enough ! thanks