I think I interrupted kernel configuration process so now it doesn`t work correct.
I installed pae kernel with synaptic and rebooted pc.
It was loading very slowly so I thought it hung.
After second reboot it loaded but videodriver didn`t work and system said "filesystem ext3 is not supported".
So I think it lacks some modules because I interrupted kernel configuration during first boot.
I tried to reinstall kernel with synaptic but with no success. It keeps configuration in some place.
So how can I erase all bad configurations for pae-kernel and make completely new installation?
This time with more patience.