Unable to solve Java "ClassNotFoundException" error.

When a Web site uses the Java add-on, an error indicating "ClassNotFoundException". Tried to disable all the modules and error still occurs. Tried from Windows 7 Mode without failure and still error. I uninstalled and reinstalled Java saveral times and still not solved. Windows 7-64 bit. I tried Internet Explorer 9 32 and 64 bit IE9. I also tried other browsers such as Firefox and Google Chrome and still have the same error. What can I do to solve the problem?

Hello

As none of the steps help, I would suggest you to perform a system restore to the date when the computer was working fine before.

The System Restore tool uses points of restore to return the system files and settings to an earlier point in time. You can use it to restore the operating system to a point in time where you have not experienced the problem.
| Note: when you use system restore to restore the computer to a previous state, programs and updates that you have installed are removed.

Please refer to the below of the help links on performing a system restore.
http://Windows.Microsoft.com/en-us/Windows7/what-is-system-restore
http://Windows.Microsoft.com/en-us/Windows7/system-restore-frequently-asked-questions

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