Well, win98 just did redetect the whole thing without any kind of problem, so I thought I could do the same thing in win2k...
Anyway, yes, I'm using an ata66 hd on this controller, while the previous mobo didn't support it, so the hd was running as an u33... I could try disabling it...
I did made a backup of the important things, so in effect, reinstalling the system could be the right choice...