Active X Component error

Hi all,
Thanks in advance for any help you can give as I'm pulling my hair out.
 
I have written a vbs program that unzips some files - manipulates the content and then rezips and saves to a different location. This program worked fine on my pc (W7) but when transferred to the user pc (NT 4.0) it throws an error on the following line of code:
 
      set objShell = CreateObject("Shell.Application")
 
Error is: Active x component can't create object 

I have searched the net and found a site that advised to run "regsvr32.exe wshom.ocx" and "regsvr32.exe scrrun.dll" from the command prompt but this has not solved the issue.
 
Anyone able to help me or at least point me in the right direction?
Please let me know if I'm not providing enough information.
Thanks again.

Well the first point that I would make is that there are significant differences between the WSH on W7 and NT 4.0. I have not dealt with NT 4.0 in a long time, but I seem to recall having to use a 3rd party solution for zipping files in a script. Pretty sure that I used pkzip.

Thanks for the response ebgreen - I had pretty much come to the same conclusion myself. Bit annoying but hey ho. Thanks anyway.