>>>>There was a blog post on this problem by Doug Hennig.
>>>>
>>>>http://doughennig.blogspot.com/2007/11/fixing-reinstall-your-app-problem.html
>>>thanks. but I can't find those entries in my registry
>>>
>>>Peter
>>
>>Have you identified which ActiveX is giving you the problem?
>
>don't know but most likly the treeview

What are you using for installation? Doug's post talks about TreeView specifically, but perhaps the GUI is different. I'm not sure how you will search the registry without knowing the GUI.