Windows 7 Region Lock Issues Prevent Playback of DVD on Windows 7 Machine

It seems like you are encountering a region lock issue when trying to play a DVD burned on a Mac in a Windows 7 machine using Windows Media Player. This error message typically occurs due to the difference in region coding between the DVD and the DVD drive on the computer. Here's what might be happening: 1. DVD Region Codes: DVDs are often coded with region restrictions to control their distribution. There are six region codes around the world, and if a DVD player's region code doesn't match that of the DVD, it may not play. 2. DVD Drive Region Settings: DVD drives in computers are typically set to a specific region code, and they can typically only be changed a limited number of times (usually up to five changes). Since the DVD plays on a Vista machine, it suggests that the DVD region code matches the region setting on the DVD drive of the Vista computer. To resolve this issue on your Windows 7 machine, you have a few options: 1. Change DVD Drive Region: You can change the region setting of your DVD drive on the Windows 7 machine, but keep in mind that you can only change it a limited number of times. 2. Use a Third-Party Media Player: Instead of Windows Media Player, you can try using a third-party media player like VLC Media Player. VLC is known for being able to play DVDs regardless of region coding. 3. Remove Region Lock: You can also look into software or tools that can help you remove the region lock from the DVD, allowing it to play on any region-coded DVD drive. Try one of the above solutions to see if you can successfully play the DVD on your Windows 7 machine. If you need further assistance or have any more questions, feel free to ask!