If this problem just happened a couple of days ago and your computer sound is working fine before then you can do a System Restore to bring back previous setting of your computer where the sounds works fine. HOW?
Important: System Restore will delete recent program installed or recent changes you made in your computer depending on your date of restoration.
Follow step below: (Windows 7)
1. Navigateto the Start -> All Programs -> Accessories -> System Tools program group.
2. Clickon the System Restore programicon.
3. ClickNext > on the Restoresystem files and settings window.
4. Choosethe restore point that you want to use.
Note: Check the Show more restore points checkbox tosee more than the most recent restore points.
5. Click Next >.
6. ClickFinish on the Confirm yourrestore point window to begin the System Restore.
Note: Windows 7 will shut down to complete the SystemRestore so be sure to save any work you might have open in other programsbefore continuing.
Important: System Restore will not revert any of your non-systemfiles like documents, email, music, etc. to a previous state. These types filesare completely unaffected by System Restore. If your intention with this toolwas to recover a deleted non-system file, try using a file recoveryprogram instead of System Restore.
7. ClickYes to the Once started,System Restore cannot be interrupted. Do you want to continue? dialog box.
8. SystemRestore will now restore Windows 7 to the state that was recorded in therestore point you chose in Step 4.
Note: The System Restore process could take several minutesas you see the "Please wait while your Windows files and settings arebeing restored" message. Your computer will then reboot as normal whencomplete.
9. Immediatelyafter logging in to Windows 7 after the reboot, you should see a message that SystemRestore completed successfully.
10. ClickClose.
11. Checkto see if whatever Windows 7 problem you were troubleshooting has beencorrected by this System Restore.
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