I think advise given above is right to the point.
Not every format (CD-R, CD-RW, DVD-R, DVD+R, DVD-RW, and then, unfinished vs finalized CD/DVD while burring) is compatible with every player at home. Especial attention is for older players that are very fussy for one media or format and not another.
With computers especially again old ones/older OSs, you need a decoder to open up the DVDs.
If you need to know any information about CD/DVD media, burring, softwares, of more importantly, which DVD player can play what, use this link:
>>> L I N K <<<
click on DVD player in tomato color section on the left and enter yours or theirs exact model to see what media are compatible. I strongly recommend this site to anyone has to do anything with CD or DVD.