Insignia D400, new Radeon 9250, Sony DDU 1613 not...

I have an Insignia D400 2.8 ghz with 512 meg of RAM. My Sony DVD was working fine. Then I upgraded my graphics card to the 256meg Radeon 9250 since my onboard Intel was only 64megs so I could run MS Flight Simulator X. I had previously loaded the game from the DVD, but when it ran too slow because of the card I deleted it until I could upgrade. Now that I have, the DVD will not see data, and actually doesn't run a DVD, although it seems to be working according to the troubleshooting. It gives the following message when I put in the MS FSX setup DVD which may give a clue. I hope someone can help. It says:
This disc contains a "UDF" file system and requires an operating system
that supports the ISO-13346 "UDF" file system specification.

I have XP Home/SP2. I didn't have any other problems until the upgrade. Any help would be appreciated.

---Dean