Next time you post, how about giving us a little more to work with.
Type of operating system; type of Office product (i.e., Word 2003);
how are you trying to open the PDF files (by clicking on the file names,
by clicking on web links containing PDF file references, or both?).
And please don't shout at us by using all caps. It's considered rude.
Download/install/execute the Adobe PDF reader at:
http://www.adobe.com/products/acrobat/readstep2.html
If you're having trouble opening PDF files in MS Internet Explorer windows,
Visit the following web site:
http://windowsxp.mvps.org/ie/pdf.htm