Do you have Adobe Acrobat's reader?  It can be downloaded for free from:
http://get.adobe.com/reader/  
Make sure you UNCLICK the McAffee protection, unless you just want it.
Otherwise, go to the bottom of the page and look for the download button.

Once you have Adobe loaded you can simply double click on any of our books and have it open in Adobe Acrobat.

I'm also getting the Big Question:
Will your pdf books play on Sony E. Books
Well, according to Sony:

"Reader digital books support Adobe® PDF,
Microsoft® Word, BBeB® Book
and other text file formats,
as well as ePub/ACS4 and connection
with Adobe Digital Editions.
You can even play back unsecured MP3 and
AAC audio files on the Reader Touch and Daily Editions."

 

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