>>The Inno Setup 'regserver' flag should be equivalent to registering the control manually with RegSvr32. Can you successfully register the control from the command line on the target machine using RegSvr32? If not, see the 'Installation Notes' section of the bbListView help file - maybe a required file is missing on the target machine.
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>I browsed through the news archives and found that the .PLB which accompanies the OCX need to be registered and I guess that solved the problem. Appreciate your help.
>
>Any advise for TreeView distribution?

If you're deploying a VFP 6 app you can redistribute MSCOMCTL.OCX, which contains the treeview control. In your Inno Setup script, install it as follows:

[Files]
Source: \winnt\system32\mscomctl.ocx; DestDir: {sys}; Flags: regserver sharedfile restartreplace