Debugging Vista: OutputDEbugString shows nothing


I am debugging small credential provider DLL and wonder where is my
debug output(I see smtimes debug string like HAL: wake sleep).
I am connected with WinDbg via FireWire and certainly I have connection
and can debug my dll.
Starting DebugView leads to hunging up system because WinDbg begins to
print zillions messages from the sxs.dll(I am using RC2 Vista).

Any tricks?

Thank you,

might help