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Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.
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Might be a long shot but, have you tried to open Visio and then from there click File>Open and choose one of the files you want to view. Also try holding shift and right click the file you want to view then go to "Open With.." and reselect the Visio viewer. If all else fails you could try reinstalling the program.
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