Existem alguns links úteis aqui:
O Uninstall Microsoft Office 2010 suites with Microsoft Fix it
ajudou a resolver esse problema.
Eu tentei instalar o Visio no Windows 7, mas recebi a mensagem de erro abaixo.
You cannot install the 64-bit version of Office 2010 because you have 32-bit Office products installed. These 32-bit products are not supported with 64-bit installations:
Microsoft Office Single Image 2010
If you want to install 64-bit Office 2010, you must uninstall all 32-bit Office products first, and then run setup.exe in the x64 folder. If you want to install 32-bit Office 2010, close this Setup program, and then either go to the x86 folder at the root of your CD or DVD and run setup.exe, or get the 32-bit Office 2010 from the same place you purchased 64-bit Office 2010.
Não consigo encontrar o Microsoft Office Single Image 2010 na lista de programas, por isso tentei usar o Corrigir da Microsoft para remover o software, mas isso não resolve meu problema.