activex can't create object / wshom.ocx

[reset-leo]

hi gurus!

i'm using a WshShell object to write a registry setting. therefore, i added a reference to wshom.ocx to my project.

    'strAvEnv was defined, etc.
    Dim regObj As New WshShell
    regObj.RegWrite "HKEY_CURRENT_USER\Software\Marcam\Asset Management Client\database\ENVIRONMENT", strAvEnv
    Set regObj = Nothing

i packed all stuff into a setup routine (using the setup tool provided with the VB 6.0 IDE).
if i set up a pc with Windows 2000 and all the latest updates and patches (SP 4), and afterwards install my program using the setup routine, i keep getting the error "activex component can't create object" on the above code. on a plain win2k without updates, everything works fine.
can anyone give me a hint what is the reason for this?
i would also appreciate if anyone knows another way (w/o wshom.ocx) to write this single registry setting from VB.

thanx.