my mother board is intel 945gv and sound card is realtek. i have intex speaker 5.1, the same configuration is working in window xp, but when i install window 7 the problem occur. i download & install the new driver from realtek. but the problem still
What is the model/vendor of the computer? Have you looked at the configuration of the speakers and set them to 5.1 operation?
right click the speaker icon on the system try go to playback devices then sleect speakers, then click configure set your setup to 5.1 and your done.