To use Articulate Studio '09 with PowerPoint 2010, you must install the 32-bit version of Microsoft Office. Studio ‘09 doesn't support the 64-bit version of PowerPoint 2010 (the Articulate menu will be missing in PowerPoint).
Microsoft has released 32-bit and 64-bit versions of Office. Microsoft recommends installing the 32-bit version of Office 2010 on both 32-bit and 64-bit supported operating systems. Microsoft makes this recommendation since existing third-party add-ins (such as Articulate Presenter '09) won't run in a 64-bit version of Office.
A Note About Click-to-Run Versions of Office 2010
Microsoft has acknowledged that Click-to-Run versions of Office 2010 can interfere with add-ins. Therefore, you should avoid installing a Click-to-Run version of Microsoft Office 2010. It won't work with Studio '09.