Thanks. So if I understand you correctly, you can NOT play any DVD what-so-ever using the DVD/CD-ROM that came with your unit right?
Can you play CDS?
Thanks. Try this Microsoft Fix It Tool first.
After you run this and it does its thing, try to use your dvd player again. Also try opening it with Windows Media Player if you can as well.
BEST OF LUCK!GOD BLESS!