Hi,
Could you please try deleting the Browser Cache history, i mean deleting temporary internet files (IE -> Tools -> Delete Browsing History [select Delete Temporary Internet Files]) ?
Close current IE instance. Open new IE instance and Load the application, the webpage should solve the problem.
If this didn't work, please try to disable the add-on in the IE and try accessing the CRM App.
Hope this helps.
Thanks, Ranjitsingh R | http://mscrm-developer.blogspot.com/ | MS CRM Consultant