Restore disc burn

peregrino

I recently bought a used 7741Z.  I restored it to factory settings using the installed software.  I then tried to create the three restore discs.  Disc 1 worked fine.  It took three tries to get disc 2 and I gave up after the fifth try on disc 3.  The process goes through the "creating" part but stops during the "validation" (or whatever it was called) part and kicks out the disc when 32%-99% of the "validation" is done.  I had the same problem on a new Acer desktop, but finally got all three discs done after blowing through at least half a dozen DVD's.  Any suggestions?  Thanks.