gp.AddToolbox "C:/Program Files/ArcGIS/Desktop10.0/ArcToolbox/Toolboxes/Conversion
Is the machine that has ArcGIS 10 64 bit? If so check out the following KB article:VBScript and JScript geoprocessing scripts do not run on a 64-bit Windows OS
Do you have VBA license installed? In 10, you need to install license separately. Request support for the license.
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