If you are having difficulties viewing the PDF documents on this webpage, Download the latest free Adobe Acrobat PDF reader 9.1 here.
If you are still experiencing difficulties, check the following:
If your system has two versions of Adobe Acrobat Reader, uninstall both the versions and then install the latest version and the latest update. If you have earlier builds, update to 6.0.1 or above. Click Help menu and choose Update. BTW, updating to 6.0.1 also fixes another problem explained here
Open Adobe Acrobat Reader and click Edit, Preferences. Choose Internet in the Preferences window. Uncheck Display PDF in browser option and close the dialog. Repeat the same and this time, enable the Display PDF in browser option.
Adobe Acrobat Reader v6.x has Detect and Repair feature under the Help menu. See if repairing Adobe Reader helps you resolve the problem.