Vista - Playing back DVDs created with Windows DVD Maker

I have used Windows DVD Maker (under Windows Vista) to create several DVD-R
DVDs containing photos from my digital camera. But I have been unable to
play them back, either on Windows Vista or on several DVD players connected
to TVs that I have tried.

I downloaded a 30-day trial of a program called PowerDVD (from Cyberlink),
and it is able to open an play these DVDs. But without PowerDVD installed,
nothing appears to be able to play these DVDs.

Questions:
1. What software on "standard" Windows Vista (Home Edition Premium, with
Service Pack 1 installed) should be able to play a DVD created with Windows
DVD Maker?

2. Since Windows DVD Maker CLAIMS that a DVD it creates should be able to
"play the DVD in a DVD player and watch the movies and slides shows on TV,"
what else should I try to accomplish this? I verified that the DVD Player I
was using supports DVD-R format.

Please include victor@xxxxxx in your reply.

Thank you,

Victor Schwartz