Setup Error, can’t install the 64-bit version of Microsoft Office

Hello,
I am trying to install 64 bit-version of Office on my machine with 32-bit but I receive the following setup error message. Can I install 64-bit Office on machine without any problem or I need to install 32-bit setup? I need your suggestion.
Thanks.

Setup Error
We can’t install the64-bit version of Office because we found the following 32-bid programs on your PC:
Microsoft Office Professional Plus 2010 Please uninstall all 32-bit Office programs, the retry installing 64-bit Office. If you want to install 32-bid office instead, please run the 32-bit setup.
