If I am understanding you correctly you are stating that previously you played this particular back up copy of a DVD in you stand alone desk top player but now this particular back up copy of a DVD will not play in your stand alone desk top player. Is this correct?
If so your problem is that the blank DVD media you used to make this particular back up copy of a DVD has deteriorated. This deterioration is called â€œDVD Rotâ€ which is caused by the use of cheap, inferior, substandard DVD media.
To acquire information on the topic of DVD Rot suggest doing a Google search on the topic (http://www.google.com)
A little help in deciding which DVD media to use.
Suggest visiting the CD Freaks DVD Recorder Forum (http://club.cdfreaks.com/forumdisplay.php?f=61) for your particular DVD Burner and see which DVD Media other Forum members have reported that work for them.
Suggest visiting the CD Freaks Media Forum (http://club.cdfreaks.com/forumdisplay.php?f=33) and see which DVD Media other Forum members have reported as good reliable DVD media.
Suggest visiting the Video Help DVD Media List (http://www.videohelp.com/dvdmedia) and see what other users have reported about particular DVD Media.
Concerning the quality of DVD media. The saying â€œYou Only Get What You Pay Forâ€ fully applies to DVD media. If the price is cheap the quality is also probably cheap. Remember most dropouts, freezing, skipping and other related problems can be traced to cheap, inferior, substandard DVD media.
Some problems caused by poor DVD media can be overcome by taking a couple actions. Slow down your burning speed. Limit all background activity while Burning DVDs including Ant-Virus programs. Defragment your Hard Drive (Start/Programs/Accessories/System Tools/Disk Defragmenter). Check for Spyware by running Spybot-Search & Destroy (http://www.spybot.info/en/index.html)