Cm 5570 with the vh 203t monitor audio

If you are using VISTA follow this steps sir, in the task bar you see a small speaker symbol , if you right click it you can goto playback devices and in that you can see a list of devices, on right clicking on each device you can see the test option as well as the set as default option , you have to set the device as defualt by noticing the which device is making sound , if you set that exact device as default device you can solve the problem. thank you dont forget to vote for me.