Streaming Errors in Windows Media Player
The following information might help you troubleshoot the issue. 
Cannot play the file 
Windows Media Player cannot play the file. You might encounter this error 
Message for one of the following reasons: 
Your sound device, such as a sound card or sound controller, requires an 
Updated driver. To determine if an updated driver is available, see Windows 
Update at the Microsoft Web site, or see the sound device manufacturer's Web 
Site. 
Your sound device is not functioning properly. Try using Device Manager to 
Check the status of your sound device. 
To check the status of your sound device 
Do one of the following: 
If you are running Windows XP, click Start, right-click My Computer, and 
Then click Manage. 
If you are running Windows Vista, click Start, right-click Computer, and 
Then click Manage. 
In the pane on the left, click Device Manager. 
In the pane on the right, expand Sound, video and game controllers, and then 
Look for the name of your sound device. 
Do one of the following: 
If your sound device is listed but the icon includes a red "X," the device 
Has been disabled. To enable the device, right-click the icon, and then click 
Enable. 
If your sound device is not listed, in the pane on the right, expand Other 
Devices. If Multimedia Audio Controller appears in the list, right-click the 
Icon, and then click Update Driver or Update Driver Software. Follow the 
On-screen instructions to find and install the driver software. 
If you are not able to find and install the correct driver software, see 
Your computer manufacturer's or sound device manufacturer's Web site for 
Further assistance. 
You do not have a sound device installed on your computer. Install a sound 
Device, and then try to play the file again. For details, see your computer 
Manufacturer's or sound device manufacturer's Web site. 
And other possible reasons about my sound device, I have followed all them 
Instructions although I didn't think it would be to do with the sound as 
Music plays fine. 
I have tried updates, I have tried using older versions of media player, 
Tried using realplayer but to no avail. But I can watch videos on utube 
I hope there is someone out there who knows how to sort this 
No problems with sound device etcetc and its only video on one machine 
Running media centre 2005 
video that is taken from the good comp to the one not working, via a nother 
Drive plays OK , when you download videos , or capture video from a camera , 
These will not play and give the error message, but only on one machine