If you don't know what SuperPreview is check it out here: http://expression.microsoft.com/en-us/dd565874.aspx

I ran into an issue when trying to render a web page in either IE8 or IE 8->7 compatability mode. I'm running the application on Vista x64. Basically, I get an error that says "Insufficient memory to continue the execution of the program." 

SuperPreview works just fine in IE6 mode which is the main reason I got it, but I want to do the onion view of the two IE versions over one another.  Anyway, I searched online for the issue and on the Expression Web forum, it just says to e-mail superbug@microsoft.com to get assisstance.  I did this, and within about 12 hrs, I got back another version of "Preview.HostedIE6Shim.dll" which replaces the file of the same name in the root installation folder for SuperPreview.  

I did this , and everything works now as expected. Very cool product, I can't wait to see the next releases that support the non IE browsers!