ClassFactory fail to CreateObject("InternetExplorer.Application")

[Tom Brown]

Hi, I've had no luck with this in the scripting groups. Maybe someone here can
help.

I get an error whenever I try to script IE

Set IE = CreateObject("InternetExplorer.Application")

Error: ClassFactory cannot supply requested class
Code: 80040111

(Win2K, VBS5.6)
nothing in Event Log, IE (5.5) works fine otherwise.
also tried "InternetExplorer.Application.1"
I am Administrator, same problem for all users.

I have tried this reference in VB6/VBA:
Library SHDocVw / shdocvw.dll / Microsoft Internet Controls
Intellisense works, but I get the same error :

Run-time error '-2147221231 (80040111)':
Automation error: ClassFactory cannot supply requested class

any suggestions please?