Hmm... this is probably due to the Shadowbox code trying to instantiate a QuickTime ActiveXObject (it does this when it tries to detect which plugins are installed). However, I haven't personally experienced this issue. Is there some security policy enabled on your browser? Some anti-virus software that you're running perhaps? That could be what is triggering the error. I'm running IE 7.0.5730.13 on a vanilla install of Windows XP Pro.