Please post in the correct section next time. Office 2007 is a 32 bit application - no 64 bit available,it can run on a Windows 64-bit platform (Windows XP, Windows Server 2003, and Windows Vista) but there may be some feature limitations.
I just wanted to add that it would have been a lot easier if the OP typed that in the google search box and clicked search
Office 2003 is for free? I've tried searching for this info myself but it seems as if it's NOT free. If this is true, please show me were so I can use it. Thanks.