Today I wanted to install Visio 2010 on my SharePoint 2010 development machine. But the problem was I simply could not because there was already an Office 2010 64-bit application installed. Correct, yesterday I installed SharePoint Designer 2010 64-bit. Now comes the downside of this;
You can’t install Visio 2010 32-bit version when a 64-bit Office application is already installed on the system.
Conclusion, if there is no specific reason for installing a 64-bit version of Office. Simply install the 32-bit version.