|Are you running a 32bit or 64bit Windows? Is the version of Office made for 32bit or 64bit?|
Operating System: Windows XP with Service Pack
(SP) 3 (32-bit operating system (OS) only) or
Windows Vista with SP1, Windows 7, Windows
Server 2003 R2 with MSXML 6.0, Windows Server
2008, or later 32- or 64-bit OS.