Error loading visio generated webpg: 'Attribute only valid..

Hi, any help is appreciated with this frustrating problem...

Problem:
----------
Received error on some PCs (but not others) when loading a webpage generated
by Visio.

Error detail:
---------------
Error: 'Attribute only valid on v:image'

The error occurs at "this.s = docEl.style;" in this section of the webpage...

function CViewMgr(convertedImgID, highlightDivID)
{

...
var docDrawing = frmDrawing.document;
if(docDrawing)
{
this.docDrawing = docDrawing;
var docEl = docDrawing.all(this.id);
if (docEl)
{
this.s = docEl.style;


Setup of my failing PC:
---------------------------------------
Webpage generated from Visio 2003 using VML option
Microsoft windows XP SP2 with all important updates.
IE6 with all important updates.
Windows firewall enabled or disabled. No other firewall software.
Symantec antivirus (auto-protect enabled or disabled)

Workaround:
---------------
Change Visio webpage generation option from VML to JPG (or PNG or GIF).
Able to load webpage. Would prefer VML, though, due to zooming features.

Comparision with "barebones" PC:
-----------------------------------
The webpage CAN be read on a "barebones" PC. This PC has a minumum of
applications installed and is used rarely. It includes these same essential
applications:
Microsoft windows XP SP2 with all important updates.
IE6 with all important updates.
(no symantec, many other programs not installed)

Using the debugger, I can see the barebones PC processes the offending line
in the webpage above with no problem.

I attempted to match essential settings of the failing PC with this
barebones PC. Regretfully, no improvement. The changes included: security
settings, internet options, uninstalling microsoft vm, unistalling java,
disabling add-ons.

Comparison with neighbor's PC
--------------------------------------
My neighbor was also unable to load the webpage with the same failure. He
has a PC similar to my failing PC.