Remember, there are two important devices involved with your HD Audio
=> Microsoft UAA Bus for HD Audio
=> Sigmatel sound card

1) As regards, Microsoft UAA Bus Driver for High Definition Audio the Dell driver only asserts Microsoft KB835221 (i first noticed back in post #16. Shoulda noted the version numbers then! oh well)

2) Now I believe at least part (maybe the root) problem is: (won't know till we fix it)
=> You have a mismatched set of driver files and .dll library versions. (I can see how this might also cause all those different MS Kernel driver load errors. I caught WDMaudio driver problem side-effect as a good symptom. But guessed the wrong fix!)

We have two different ways to go

Option1. Let's first just try applying MS KB888111 and see if it cleans all things up

• Before the MS update, if you Start->Run, enter serviwin drivers, scroll to HDaudbus.sys it shows: version 5.10.00.5011
• After the MS update, it should show version 5.10.1.5013
• Reboot and check if driver errors (they may have installed correctly here)
• If Sigmatel sound card is STILL an error, go to device manager, rt click on Sigmatel sound card, click Update Driver
  • When it asks to go looking say NO, not this time (next)
  • Install from a specific location (next)
  • Don't search. I will choose driver location (next)
  • (You may or may not be asked to choose a device: if you're asked, choose Sound at this step)
  • Click Have Disk, Browse C:\DELL\drivers\R171789\WDM (next)
  • Click as needed to allow install to run and Finish

Notes:
=> just fyi...so you know... way back when you last double clicked that Dell install file it first unpacks itself into
C:\DELL\drivers\R171789. Those files should still be there. But if not, you can double click that Dell package again. Once its done unpacking files, it then starts the install BUT CANCEL it!
=> The path i had you browse to above for Update Driver C:\DELL\drivers\R171789\WDM is installer info just for Sigmatel portion of the install (so Update Driver then skips any attempt to reapply any old KBs should it make any difference)

Option2: We upgrade to XP SP3 which should also clean up things. But need some prep before the upgrade if we take this route to make sure is smooth going

One would think that Dell and Microsoft would have all this fully tested and patched for newer bugs in their install packages by now since both the Dell's driver and Windows HD audio updates have both been out for a couple years already!

• The early bugs in original SP3 upgrade were all fixed by last summer. The upgrade seems to go without problem for most people since last fall
• tho i don't know whatever is about computer's settings or "quirks"that cause all the current pain-in-the-@@@ problems and if may also afffect Windows' SP3 upgrade
• Can you perform a full system backup? do you already have backup software and media? Is a good thing to do in any case. But certainly before the SP3 upgrade
• There's a little other prep work too..like just making sure enough disk space, etc.

• In whcih case need see just what-the-heck Windows is doing now. (I'll still look at Logitech whether in SP2 or SP3
• Also don't know if you have any input or preference on doing the SP3 upgrade next or we continue to look at current SP2 issues

- You should be ok to simply uninstall ATI using Add/Remove Programs
===> i see 2 things for ATI in your Add/Remove list, one is called ATI - Software Uninstall Utility. Uninstall that one
- Then download the audio driver from Dell site (link in prior post) and run the Dell install package to reinstall your driver plus ATI Catalyst
- Let me know if ATI is back to normal again

As for the Logitech filter LVUSBSta.sys
- I’ll need to get some more info from you before we can figure out what to about LVUSBSta.sys filter in the long term
- For the short term, we can

• Uninstall both the Logitech Cam driver AND the filter LVUSBSta.sys OR...
• We can leave the Cam driver installed and I give you a script that only removes LVUSBSta.sys filter BUT fyi the Logitech Cam driver checks periodically and will keep putting the filter back!! I don’t know yet if it’s possible to stop the driver from doing that

Some more info i'll need to start
- What’s your WebCam product name? Confirm cam’s product name by click for the logitech site, select among Logitech’s list of names and they’ll show you a picture of the cam so you confirm
- Find the web cam in device manager. Rt click Properties. Click Driver tab. Which driver version does it say you are running?

1. Were there two ATI entries in Add/Remove programs with names somethin like: Software Uninstall Utility and other ATI Display Driver
2. You ran the ATI Software Uninstall Utility?
3. Did you stop when you still saw errors? or you also ran the re-install?

Create a restore point before continuing with steps below
Start->All Programs->Accessories->System Tools->System Restore Then create a restore point/

1. Check to see (and tell me if either of below are still there)
   1. In Add/Remove Programs, is ATI Display Driver still listed? If yes, remove it
   2. Look In Device Manager, find your graphics adapter device. Rt click Properties. Click Driver tab. Does it indicate an ATI driver? I believe once ATI driver removed it'll show a driver named something like Microsoft generic VGA driver. If still indicates ATI Display Driver, rt click uninstall it
2. Download: Driver Sweeper
3. Boot into safemode. Run driversweeper (check the options to remove ATI stuff) Reboot to normal
4. Run the Dell install package to reinstall your video drivers

• Can you do without it for awhile? Am thinking would be good if it's uninstalled while trying to get other stuff working as not clear what impact it might be having
• If you should need it you could reinstall but then uninstall again before any other testing on other stuff
• To try and get current driver info, try this: Web cam should be plugged in, turned on. In Device Manager, find the web cam (will probably under USB devices), rt click Properties, Driver tab. Should say Logitech, driver date, version number?

Start->Run, enter notepad. Copy the code into notepad. Save to a file. Rename the file and change file extension to .bat

devcon classfilter media lower

devcon classfilter media lower !LVUSBSta
devcon restart “HDAUDIO\FUNC_01&VEN_8384&DEV_7690&SUBSYS_102801F5&REV_1022”

My error. As you noticed! The batch window closes immediately after the commands run so there's no time to see the output! To remedy this, you can simply add the pause command at end of each batch file so the script pauses window won’t close till you type any key

Code:

pause

1. Output from first batch file to display filters
When you run this display current filters command you see Class filters unchanged. followed by the filters found (e.g. LVUSBSta when the Logitech filter is still being applied)

2. Output from second batch file to remove the Logitech filter
The first output line is either Class filters changed. Class devices must be restarted for changes to take effect. if the command succeeded and change applied or devcon failed. if the command fails (e.g. the filter wasn't there to begin with).
You then see the list of filters that apply. So if you see any empty list with no filters displayed here is a good thing.

The device must be restarted for the change to take affect. So I included a restart command in the batch file

Now a reboot would also do a restart but i'm not sure if the Logitech driver if it's still installed at time of reboot it may also try and put the filter right back! (you may want to test this out first to see if it reappears after reboot) So you may need to play with the order in which you do things: as to removing the filter, uninstalling the Logitech driver, then reboot. Or maybe uninstalling Logitech driver first, then removing filter, then reboot.