Dean called and said his computer is running windows 2000, and at times Internet Explorer “freezes”…when he right-clicks, he sees and error message relating to (what we believe to be) shdocvw.dll
My “down and dirty” recommendation is to uninstall as many versions of Internet Explorer as possible (“How to Uninstall Internet Explorer 6”)…and (try to) install a new copy of Internet Explorer 6…
(Internet Explorer 7 is not available for Windows 2000.)