I have the problem sloved for the important part! I don't know what the problem was, but I had problems with the amberkrn.dll file with bryce 5.5 and the dzcore.dll file with bryce 6. These .dll are in the bryce folder.
I uninstaled bryce 5.5, 6 and dazstudio. Then I install everything again with everything enabled (so install d|s 1.5 and 1.7) and bryce 6 works!
Bryce 5 did work until I instals bryce 6. Now it gives the amberkrn.dll enterypoint message again. Tomorrow I try to instal 5.5 again.
I want to ask you if it is possible to have bryce 5.5 and 6 on the same pc?