I only know there is an integration issue on Vista* 64 with VS 2005/2008, should have no problem on Vista* 32. 1) Do you have any problem to run call graph for VTune Analyzer standalone? 2) Can you run call graph with VTune examples? 3) Are you using latest product v9.1 U1?
If you saw some info like as "One or more components are missed...", you definitely need to uninstall/reinstall the product.