If you want to install 32-bit Office 2010, you must uninstall all 64-bit Office products first, and then run setup.exe in ...

If you want to install 32-bit Office 2010, you must uninstall all 64-bit Office products first, and then run setup.exe in the x86 folder. If you want to install 64-bit Office 2010, close this Setup program, and then either go to the x64 folder at the root of your CD or DVD and run setup.exe, or get the 64-bit Office 2010 from the same place you purchased 32-bit Office 2010.