4 Rico:
Yes, I do speak slovak. But I don't have ICQ number.
4 Master:
I think, AGP 3.0 is the problem. Win98 probably don't know how to manage with it.
4 all:
I give up. Nothing seems to help me. I've tested about 15 Detonator versions, all DirectX versions (6, 7, 8, 9), VIA chipset drivers (from CD and newest) and their combinations. It took a long time testing all of this and I didn't find any possibility to run Win98 on that computer. So it seems, I have to use Win XP only. :-( Maybe I install Linux again.

Thanx to all of you...