Problem with SDL Sound when played as Administarator?

i have strange problem with all sdl sound progs (also the lopaudio demo).
when i play sounds loged in as normal user then everything works fine. if i
start a SDL soundprog as administrator and no other sound prog. is running
the playback is klicking? i use win2k and a standard ess solo 1 card.

does anybody have a similar experience? know any help?