If sound is from build-in audio that the bios is enabled. Next, be 100% sure you do have the right driver for your audio output. Follow up by verifying that the correct audio port(s) are used. Once all done, check(test) the audio using the s/w that maybe provided. if none, goto the audio&sound devices" check properties of the control panel for audio and try there. Also, under the audio button(check all), that proper audio device is selected for output. One of these should hit on an audio fix.
Of course, I exclude any reference to the dual OS installs, they may cause an issue. I rarely deal with multiple language based OSes as you can understand, but it shouldn't be an issue as only 1 OS will be used. BUT, they may default to similar files/folder areas. If one overwrites another that may cause a glitch.
My deskop is a ZT (board=MS 7267 ver 5) I have got it from a relative and at the time, it already has 2 windows xp on it (2 different language) Everything was ok until I use it to download some tunes from a russian site - the day after, my Eng windows disappear... I reinstalled a Eng copy of the Windows and download all the drivers from the manufacture site - everything work except for sound ! I reinstall the sound driver provided from the manufacture and it still tell me there is no device for sound! (I did plug in a set of speaker) I try to use the driver (realtek application from the other windows and the driver) but that didn't work. What else can I try?