Visio viewer 2007 can't open visio file (.vsd)

I downloaded and installed Visio Viewer 2007 but the program can't be found at program files. I just learned that visio file (.vsd) ext. is already associated in IE 7 but the IE7 can't open the visio file. I searched some blog and I found the solution.

The solution was to uninstall a security update "Cumulative Security Update for ActiveX Killbits for Windows 'Your Version of Windows Here' (KB973525)"

The link to the update is here: http://go.microsoft.com/fwlink/?LinkId=158202. It appears that Microsoft in it's infinite wisdom accidentally put the Visio Viewer's CLSID in the kill list. Uninstalling this update, resolved the issue and I can now open Visio documents in IE.