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If you have a Win dis try a System File Check. Go to Run / type "sfc scannow" ( without quotes and note space after sfc) have Win disc available in case sfc needs to replace or repair any files. It just runs then closes.
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I did this scan, but without disk. On my Hewlett Packard Windows is on the Hard Disk partition. Program was running less than a second as the DOS window.
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Also look at this, now I can't verify this, but comes from a respected site, Annoyances.org
Found this at Annoyances.org
Here is the REAL answer!! =)
Tuesday, August 12, 2003 at 9:03 pm
Posted by Snipe (1 messages posted)
I found this instructions when looking for an answer to this exact same problem, I followed the directions and wala! I now can see my sound card inthe greyed out areas again! Try it out fellas! Carl's solution worked like a charm for me, once I actually read it carefully enough to understand what was going on. It's truly a stroke of genius, and I strongly suggest you try his process before you go reinstalling your entire operating system. To recap in detail (for Windows XP; YMMV): 1. From Device Manager (be sure to select View/Show hidden devices), find the 'ISAPNP Read Data Port' device from the System Devices list. (Of note: once I successfully repaired this problem, this device no longer appears.) 2. Right click the ISAPNP device, and select "Update Driver" 3. Select "Install from a list or specific location" 4. Select "Don't search. I will choose the driver to install." 5. The step I left out on prior trials: UNSELECT "Show Compatible Hardware" 6. Be sure that "(Standard System Devices)" is selected under Manufacturer. 7. Under Model, scroll down until you see "Plug and Play Software Device Enumerator". Select this item, and select "Next>". 8. You will receive some frightening error message that you should probably disregard. 9. Complete the installation of the driver. You will see your device list magically change before your eyes. The other PNP devices will mysteriously become enabled and active. If not, restart. Thank you for posting this solution; it has saved endless hours of reinstallation, and perhaps a marriage as well.
hope this helps 
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I v just done this as well, and Plug and Play Software Device Enumerator was not installed succesfully (but at least it appeared on the devices list) but with yellow triangle and exl. mark again. I updated this Device right clicking on it - update Driver - and going through the Windows Update, and it worked.! Yellow triangle disappeared. List of devices had been changed as that man said. It didn't affect the sound on this stage. There was non.
However after rebooting all the devices have come back as I wouldn't do anything, to the begining stage and Plug and Play Software Device Enumerator - disappeared.
No sound.
I am sure I am on a half way to it!
