Yahoo Messenger Hangs with Cam

Well I've been almost every place else, so I thought I'd try here. I'm having an issue with Yahoo Messenger hanging every time it tries to access my Web Cam.
This happens also on the Yahoo Messenger "Test your Cam" web page.

OS: Windows XP SP2
Background: The cam works fine in Windows. It works fine in MSN Messenger.
It works fine on a different computer running Windows XP SP1.

I will post what I have done so far below, but I think I may have thought of another issue:
Yahoo may be trying to connect to my Pinnacle Studio 9 card, rather than searching for my camera.

I thinking this may be the case because the results are the same whether my camera is plugged in or not. Does anyone know where this information is stored? A registery entry? An ini file somewhere? As you can see I've uninstalled and reinstalled many times; so I'm thinking it is someplace the uninstaller isn't deleting.

I know I have a conflict someplace, I just need some direction to find it and workaround it.

Any help would be appreciated.

Linus

P.S.
Yes I have opened about 12 calls with Yahoo Support. They say the problem is with my system, but offer no help in trying to figure out what it is or where to look.

What I have done so far:
Reproducing the Symptom:
o Start Yahoo Messenger
o Select "Messenger -> My Webcam"
o Warning message displayed, covering portion of the
YMessenger window. Selected OK.
o Warning message disappeared.
o Spike in CPU usage
(from about 2% to 50% then immediately back
down to 2%).
o Network was accessed.
o The portion of the Yahoo Messenger window
that was covered by the warning message was not
refreshed.
o Menu Items in Yahoo Messenger do not display,
and are not available.
o Task manager indicates that TWO
"Yahoo! Messenger with Voice" applications
have a status of "Not Responding"
o Unable to terminate the processes using TaskManager.
o Other access to Yahoo Mail remains unaffected.
o All I can do is reboot.
o No error messages are created by Dr. Watson

Hardware/Software Details:
Yahoo Messenger with Voice (7,0,0,437)
MyYahoo Module (6,0,0,600)
Windows XP Professional, Version 2002, Service Pack 2
Logitech QuickCam Pro 4000
Hardware list under Control panel:
NO red "x" and no yellow "!"

Additional information
Camera sends with no problem under MSN Messager
Router has port 5100 open
Same Camera works on different computer with same
software version, same router, same network connection

Steps followed:
1. Yahoo Messenger uninstalled via "Add/Remove Programs"
Yahoo Messenger reinstalled
Results: No change

2. Yahoo Messenger uninstalled via "Add/Remove Programs"
Camera Drivers re-installed
Yahoo Messenger reinstalled
Results: No change

3. Yahoo Messenger uninstalled via "Add/Remove Programs"
Yahoo Messenger reinstalled
Camera Drivers re-installed
Results: No change

4. Attempted to access the page:
http://help.yahoo.com/help/us/messenger/win/webcam/webcam-18.html
Page did not work, nothing was ever displayed.
Under FireFox 1.0.7 nothing happened.
Under IE 6, IE hung, but I was able to terminate
process under Task Manager

5. Added key UseVFW as a DWord, value of 1 to the registry at
HKEY_CURRENT_USER \ Software \ Yahoo \ Webcam
Results: No change

6. Logged Support call.

After last support call with no update:

A. Reinstalled Java VM from Sun, latest version.
Results: No change

B. Installed Sun Java RTE : Java 2 v1.4.2_09 (latest version)
Results: No change.

C. Uninstalled Yahoo! Messenger
Renamed Program Files\Yahoo! to Program Files\Yahoox
Reinstalled Yahoo! Messenger
Results: No change

C. Uninstalled Yahoo! Messenger
Purged Program Files\Yahoo! directory
Uninstalled Camera software and drivers
Reinstalled Yahoo! Messenger
Installed Camera Drivers
Updated Drivers from Logitech site
Performed Yahoo Web Cam Security Update - No changes
Tested camera at
http://help.yahoo.com/help/us/messenger/win/webcam/webcam-18.html
Results: Page Hangs, no change

D. Deleted Webcam download in C:\WINDOWS\Downloaded Program Files
Tested camera at
http://help.yahoo.com/help/us/messenger/win/webcam/webcam-18.html
Results: Page Hangs, no change
File was not downloaded again, as it should have been according to the person I got the tip from.

o-end-o