You may notice a lot of the new information on the site may not download or view properly on your comuter. Specifically, the new Office (Word, PowerPoint, Excel, etc.) files have a new format denoted with a little 'x' added to the file extension.
Thus you have .docx instead of .doc Word files, .pptx instead of .ppt Power Point files, etc.
You may either update your MS Office suite to 2007 or later (that will cost you money), or you may download and install a Format Converter utility from Microsoft. This Converter utilty will allow you to deal with the new (x) formats using your existing MS Office software. And it's free.
Visit http://www.microsoft.com/download/en/confirmation.aspx?id=3 to download the Converter.