If you’re using the Visio Viewer, there’s a good chance it no longer works right now. Please take a look at this information and the link below for the potential resolution:
Some of you have recently noticed that your install of the Visio Viewer isn’t working – this is by design and can easily be fixed. Microsoft has recently released Security Bulletin MS09-55 through Windows Update which deactivates Visio Viewers 2002, 2003 and 2007 because of a security issue. With this fix we are retiring Visio Viewer 2002 as well as Visio Viewer 2003
LINK: Updates regarding the Visio Viewer
http://blogs.msdn.com/visio/archive/2009/12/28/updates-regarding-the-visio-viewer.aspx
Kurt Shintaku's Blog 