A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
My hunch is that you installed the 64 bit version of Office, in which (32 bit) activeX controls do not work.
You can get a version that is independent of bitness here: https://sites.google.com/site/e90e50/calendar-control-class
Also, I have built an all VBA treeview control in a similar fashion: http://www.jkp-ads.com/articles/treeview.asp