Microsoft Office does not read or write pdf files (although the latest 2007 may be able to, I'm not familiar with it). Some other office suites can read and write pdf (OpenOffice for example)
Most computers have Adobe Reader installed - this was called Acrobat Reader until a year or so ago. This is designed to read pdf files. Do you have that? If not is is available in many places as a free download.
Foxit is an alternative to Adobe Reader and is a much smaller program although it does much the same job.
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