I would suggest you test your speakers with another source of audio (eg. walk-man). Using cellphone radio intruption isn't a good test.
Then you can try to troubleshoot your sound card.
1) assuming your using windowsxp you should download the drivers from the manufacutrers website. (if you have a brand name computer eg. dell, sony etc.. it makes determining your sound card driver and download easier). If generic system you have to open your computer and locate the sound-card manufacturer. (NOTE: please use caution when opening computer and have to be grounded and in a secure surface with proper tools.
2) once you have downloaded the driver; right-click "My Computer" and choose manage. From the device manager
choose sound and remove the driver. Reboot your system and when it boots up it should detect your sound card; from the location you have downloaded and save the files update the driver when it prompts you.
Hope this helps
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