the installer should match the 32/64 bit version of MSOffice not your OS
Do you Enable or Disable Template Builder in your Start/Programs?
Does BIPublisher show up in the Add/Remove Programs?
After you install BI Publisher Desktop 32bit, you are not seeing the BIP ribbon on MS Word but can you see the BI Publisher Add-In
in Word Options > Add-Ins > Inactive Applications Add-Ins?