Java Plug-in Fatal Error - Several Java Virtual Machines

I have a weird error that keeps coming up on one of my customer's computers when they attempt to use a Java applet:

Java( TM) Plug-in Fatal Error
Several Java Virtual Machines running in the same process caused an error.

We have uninstalled all versions of the plugin and then reinstalled the newest from to no avail.  Also tried a fix posted elsewhere to change the runtime paremeters for java (by opening java on in the control panel) to the following: "-Xmx500m" without the quotation marks.

Using Windows XP with IE 7.

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thats the vm crashing, you could try a different browser.
May be worth reporting it as a bug to Sun

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ebertkAuthor Commented:
Tyring a different browser may work but it doesn't solve the underlying problem.  Any other ideas as to what this might be?  
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