Hello Joe,
Refer to the note below for the workaround.
http://service.sap.com/sap/support/notes/1408098
Best Regards,
Jude.
PS.As Sriram pointed out, SAPGUI 7.20 is out of support, so install 7.30 which is the only supported version at this point.
Also note that only 32bit version of Office 2010 is supported with SAPGUI, as SAPGUI is still a 32bit application.