Acrobat 5.0 ?
The current version is v11.0.6 and v5.0 will not work with many recent PDF files. Uninstall v5.0, since you are running IE 11 I presume you are using Win 7. If you are, click 'Start - Control panel - Programs and features'. Then select Acrobat 5.0 and click 'Uninstall'. Once it has uninstalled go to the Adobe web-site and download the latest version. NOTE it is now called 'Adobe Reader' and download and install the latest version for your operating system. As I said, the latest version for Win 7 is v11.0.6. You can get it from www.adobe.com, and that is your best and safest source.
If you run into problems downloading or installing it, post back and confirm the details of your operating system.