the problem is solved. I borrowed a friends arduino and tried it at my computer with 64 bit xp running and the things works just fine. It must be some hardware problem with my arduino board.
but thx for the support anyways 
the problem is solved. I borrowed a friends arduino and tried it at my computer with 64 bit xp running and the things works just fine. It must be some hardware problem with my arduino board.
but thx for the support anyways