thanks for responding brother upendra.
pls tel me to how to check that my computer supports it.
i connectd my home theatre surround sound system to my computer using an optical audio cable.
In sound settings from control panel,i selected the properties of hd optical audio.there under advancd tab only stereo setings are displayed(2 channel 16bit 48khz).and the test tune works perfectly in 2 speakers.but my other 4 speakers are not engaged in that test proces.
dear brother pls giv me a solution for that.