When a user accesses a specific site, the attached error occurs when he tries to view an embedded PDF.
I have verified this works correctly on other PCs using IE8. I have also verified that it works on *his* PC with FireFox. So it is definatly specific to IE on his machine.
OS: XP PRO SP3
IE 8.0.6001.18702 (all patched)
Attachments: 1) ScreenShot of XML error; 2) IE site error on bottom left status bar.