When uninstalling Java make sure you delete all Java deployment directories.

Delete folders 'Sun\Java\Deployment' under all AppData folders:
   C:\Users\<your user name>\AppData\Local\Sun\...
   C:\Users\<your user name>\AppData\Roaming\Sun\...
   C:\Users\<your user name>\AppData\LocalLow\Sun\...

Then install Java again.

Hello,

I still got the same issue, any hints?

Thanks.

Hi,

First thanks for your answer.
I have done what you advised me to do, uninstalled Java, Clean up the registries (using Microsoft registries cleaning tool), and installed version 7 u65 using the installer from flyordie, but I still face the same issue.
Unfortunately I cannot post a screenshot so you can understand better my issue, but after logging in I have an empty screen with "Error. Click for details" in red in the up left corner, when I click on it I have a dialog box titled "Application Error", with test "ClassNotFoundException", under it is written "mp". in the dialog box I have three buttons, details, ignore and reload. Details opens another box titled "java console" with the text below:

calling downloadEagerorAll
Java Plug-in 10.65.2.20
Using JRE version 1.7.0_65-b20 Java HotSpot(TM) Client VM
User home directory = C:\Users\Matts
----------------------------------------------------
c:   clear console window
f:   finalize objects on finalization queue
g:   garbage collect
h:   display this help message
l:   dump classloader list
m:   print memory usage
o:   trigger logging
q:   hide console
r:   reload policy configuration
s:   dump system and deployment properties
t:   dump thread list
v:   dump thread stack
x:   clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------


The other two buttons have no effect.

Thanks again.

Try clearing java cache and browser cache.

If it does not help, uninstall java completely, including registry entries, and re-install from scratch, preferably using our automatic java installers.