I solved the problem without knowing what is it....:
Maybe it can help others.
Ive installed leo on old IDE (!) HD - did work, but 10G is not enough normal functioning, so just restored image on my big SATA drive - repaired disk and permisions and now I'm able to load it from SATA.everething works (ethernet, sound -ac97), BUTvideo-gf8500gt, 512Mb - when i drag windows, the contents of the window becomes scrambled. The drivers i used - zeph's nvinject+512 extention.
What can it be?