Hey D3LL,
yes, everything works fine in IE, but the problem persists with my preferred browsers Chrome and Firefox.
(I would not want to switch to IE because of this error.)
I just uninstalled again and installed the package that gets prompted when visiting java.com with the IE, but to no avail.
IE loads applets, Chrome/FF complain about the missing java plug in...
Hmmmmmm... :/
Thanks anyway, J.