It is a known issue on Windows 7 X64. Microsoft Windows 7 Starter, Home Premium, Professional and Ultimate / Enterprise 64-bit is supported after the 9.2 update has been applied. It is required to download a hotfix, which is recommended from <a href=”http://www.microsoft.com/downloads/en/details.aspx?FamilyId=7AC6EDA7-B0BB-4EDD-B9FA-9A73A2BD2D3D&displaylang=en”>Microsoft</a>. Though it is based on Vista 64, but it works on 7 also.
Or if u get this problemsome, then try out this…..
IE8 > TOOLS >COMPATIBILITY VIEW SETTINGS and add the website that hosted the PDF file. For more info to resetting IE8, please visit <a href=”http://windows.microsoft.com/en-US/windows-vista/Reset-Internet-Explorer-8-settings”>HERE</a>
And the last word, if all the above will not work, u may go for FoxIt Reader, free and tested. For download please link <a href=”http://www.foxitsoftware.com/pdf/reader/”>Here</a>