I installed MMC7.1 without DX8.0 in Win2K.
Then installed WinDvr and the DX8.0 within it (no problem!).
Now everything is GREAT!
Except that no sound when start second time (At the very beginning.)

Then, start DScaler first and then MMC TV. There's no problem any more!
Now I don't need DScaler (which has noise in stero mode), MMC7.1 just works fine no matter start first time or second time.

Thanks for all your help!