If Adobe Reader is properly installed it works as a "plug-in" within your web browser. For Example you will see Acrobat load as a plug-in while you are still inside your browser window. If Acrobat loads as an "external viewer," (and then asks permission to download the document/file to your computer), then the software is not properly installed as a browser plug-in and hyperlinks within VCCS .PDF documents may not work as intended.  You can fix this problem by re-installing Acrobat Reader software. You will know if Acrobat Reader is installed as a plug-in if you see a new (acrobat) toolbar appear within your browser window when you click on a .pdf file.  One of the tricks to using the reader is to know what to do with the new buttons on the Acrobat toolbar. To Download Adobe Acrobat reader click on the link: Download Adobe Reader