ok here is how i "solved" it: I booted up in safe mode. My mouse hang so i just replugged it. Mouse getting stuck seemed to be caused by nod32 getting stuck in safe mode or likewise. When that was solved I set back to explorer shell and rebooted. However normal start didnt work. So I tried debug, dunno why but it worked. I reinstalled litestep and all is now well. Even nod32 is installed again ;)

Maybe I had another problem but this is in short how I "solved" my problem.