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Might be somthing in your power options go to control panel / Power Options choose never for everything see if it still does it. If it does reset it back to the way it was. Disconnect the laptop from the internet then see if the sound stops again.
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you need to update to windows 8 when you have updated you need to remove your soundcard and reinstall it.then you need to reboot your system windows will then find your soundcard and automatically update your drivers.hope this is of use.
It seems your system complicates soundcard's driver version and patches. To eliminate problem that causes inoparable one at a time; please consider to uninstall software sound applications and drivers. Remove any secondary or external sound cards and enable the built-in sound card at the BIOS. Now, start the system in Safe Mode try to remove the existing soundcard drivers at control panel sound card properties. Restart the system, well try to prove that the built-in sound card still working by reinstalling it. By then you can disable it again and install your secondary or external sound card. Hope it will work this time, else you'll need to clean up your Operating System astrays dll's using registry cleaners third party software. I met this problem before that my only recouse is by reformatting the system.
Try manually installing it by using the Add New Hardware wizard. Make
sure all other soundcard(s) are deleted from Device Manager first, though.
Another thing you can try- Boot into Safe Mode, open Device Manager, remove/delete any and all instances of sound card hardware you find, reboot and see if Windows re-detects.