Dear @HarmonyBliss02,
Thank you for posting your question in the Microsoft Q&A forum.
I apologize for any inconvenience you may encounter when using our services/ products. Based on your description, kindly try these following steps:
Disable WMP’s DirectX video acceleration
- Open Windows Media Player > Now Playing > More Options > Performance tab.
- Uncheck Turn on DirectX Acceleration (or DirectX video acceleration if that is the label).
- Select OK, close WMP, reopen, and test the DVD.
If the “Troubleshoot” slider exists: reduce global hardware acceleration
On some Vista driver stacks you can also reduce global acceleration:
- Open Control Panel > Appearance and Personalization > Personalization > Adjust screen resolution > Advanced settings > Troubleshoot tab > Change settings
- Move the Hardware Acceleration slider down (PixelMetrics suggests the “third notch”), then restart and test.
Detect decoders the Windows way
Use Microsoft’s built-in decoder detection utility:
- Press Win + R > run:
dvdupgrd /detect
If it reports No Decoders found, WMP cannot decode DVD video.
If it detects one, you can also try:
- Press Win + R > run:
dvdupgrd /upgrade
Update (or roll back) the FirePro driver specifically for Vista
Because your issue started immediately after the FirePro install, do one of these:
- Update to the newest FirePro/V5800 driver that explicitly supports Vista, or
- If you already installed a “last available” legacy driver, try the previous FirePro driver version (roll back).
Run the Windows Media Player DVD troubleshooter (if present) and remove conflicts
- Running the Windows Media Player DVD troubleshooter
- Updating codecs
- Uninstalling conflicting third-party CD/DVD burning software (if installed)
I sincerely hope you understand that the initial steps I suggested may not have completely fixed the issue, as there may still be underlying causes that have not yet been identified. I am here to work closely with you, troubleshoot effectively, and explore every possible solution to ensure the best possible outcome.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.