This forum probably isn't going to be so helpful with the no-sound issues. My usual suggestions are to fiddle with drivers and so forth, but I think you're way beyond that. You might want to try the pro audio forum (http://forums.microsoft.com/MSDN/ShowForum.aspx?ForumID=351&SiteID=1), even though that technically isn't the right place for audio support issues either...
Vista/No Sound/Failed to play test tone
i have recently upgraded to vista and found out that i have no sound. the driver (vista version) for my on board sound card seems fine but when i try to play a song on windows Media Player, i get a msg of "Windows Media Player encountered a problem while playing the file. For additional assistance, click Web Help." and i also get a "Failed to play test tone" msg when i try to test my speakers. i thought it was because of vista dosent support my crappy on board sound card so i got a new one.
i have just installed a Creative Audigy SE and have downloaded the driver for windows vista. again, in device manager, everything seems fine, the driver is fine, the device is working. but i still get the "Windows Media Player encountered a problem while playing the file. For additional assistance, click Web Help." when i try to play a song, as well as the "failed to play test tone" msg when i click on the Test button. please help me, i am tired of using a computer with no sound.
Windows for home | Previous Windows versions | Music, photos, and video
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
the solution is at the end of this thread:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2155198&SiteID=1
basically, vista is...
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Anonymous
2007-06-05T20:53:59+00:00 Guys. I've found the solution, and it isn't pretty..
Format...
I ended up getting annoyed, and simply formatting my machine. I went thru anything and everything I could think of with trying to resolve the issue. To the point of even removing the drivers manually and reinstalling them, trying older drivers, etc. Nothing works..
Unfortunately, you can't repair Vista, like you could 2000/XP.. I believe in this case, a repair would of fixed the problem
Doogal. Use Notepad buddy. That's what I used to view the file. It's just full of code tho.. Not much "English" in there.

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Anonymous
2007-06-05T19:09:44+00:00 I've still no sound. Nothing from my on-board soundcard or the soundcard I purchased (also a SB Audigy SE so perhaps your problem is the same?). I'm not sure who I should be hassling about it, don't know if it's a problem with my Dell PC or with Vista in general. I was hoping being able to read the log file might help work out what the problem is but I still don't know what to view it with.
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Anonymous
2007-06-05T18:20:09+00:00 Same situation here as well. Has there been any resolution?
I should note that my sound worked as of Friday. I had rebooted the machine Monday morning and had no sound. I assume the on-board driver took a dive so went and purchased a SB Audigy SE card, downloaded the latest drivers and still nothing.