Hi Soduko,
sorry I missed your question. Re. the control panel, it is very particular about the installation. It requires you to have both a Quartus II and a Nios II Embedded Design Suite installed - and they have to be matching versions and you're probably better off only have one version installed.
Also, be sure to copy the DE2_70_control_panel to a directory, such that the path has no spaces (Quartus II/Nios II EDS apparently has bugs when dealing the path names).
Finally, it didn't work out of the box for me with Quartus II 8.0 sp1, but there is a workaround: launch the Nios II 8.0 Command Shell and launch the control panel from that shell. Eg. I had copied the DE2_70_control_panel to
C:\altera, and thus just had to execute
cd ../../../DE2_70_control_panel/SW
./DE2_70_Control_Panel.exe
Good luck,
Tommy