|1) Generally you don't need to update drivers as long as your hardware is working OK. However occasionally a manufacturer may recommend an update if a bug is found in the current version. Some sites might charge for drivers but just avoid those. Any drivers you need for the PC you list here will be on the Dell support page for your model.|
2) There a few things you can check. First go to device manager--right click on 'my computer'-properties-hardware-device manager--and see if any yellow marks show there, especially associated with the audio. If a problem shows there you may need to reinstall the drivers.
If no problems show there go to 'sound and audio devices' in control panel. On the volume tab make sure the volume is not muted and you can check that the speaker volume is not too low. On the audio tab make sure the sound playback device is your sound card or audio adapter.
Last (or maybe it should have been first) try to check the speakers on another computer or playback device to make sure they actually are good. Also most speaker wires are thin and can easily break inside the insulation if they get twisted around too much. So check that they're in good condition.
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