you can follow these steps, try this if this will work.

1. Make sure your speakers are plugged in,turned on, and properly connected to the computer. You've probably checked this, but it's amazing how little problems like this (or the computer's sound being muted) manage to confound people.
2. Plug the speakers in to another computer, if possible. If the speakers work with the other computer, proceed to the next step. If they don't, you've probably got a problem within the speakers themselves.
3. Check to see if your PC is still under warranty. If it is, do not proceed. The help provided below may void your warranty. Contact your service provider if this is the case.
4. • Open your start menu (right-click on the "Start" button and choose "Explore"), and find the "My Computer" icon. Right-click on it and choose "Properties" from the submenu. Click on the "Hardware" tab and then the "Device Manager" button.
   • Expand the "Sounds, video, and game controllers" heading to find your sound card. The name will depend on what sound card is installed on your PC. It will most likely have a name containing "audio." It should look something similar to the example above. You'll know immediately if there is a major driver error because an exclamation point (!) will show over the card's icon.
   • Double-click on the name of the sound card to open a new window. In the new properties window click on the "Drivers" tab. If there is no "Drivers" tab then you chose the wrong sound device. Go back and try again. On the "Drivers" tab, click the "Driver Update" button. Follow the Wizard's onscreen instructions to update your driver. You can also contact the manufacturer of your PC for the most recent audio drivers. They can usually be found online.
     • If you already have the most recent driver, click the "Uninstall Driver" button. Then restart your computer. When you restart your computer, the driver should reinstall automatically. If it does not, install it manually with software (or a download) from the manufacturer.
5. Check the "Windows Troubleshooter". On the "Drivers" tab mentioned in the step above, there is a button for troubleshooting the device. Click on that button, and follow the instructions on screen.
6. Check the sound card itself. Properly shut down your PC and then disconnect all cables on the back of your PC, including the power cable. Open up the CPU, making sure to touch a grounded metal object (a doorknob or metal desk will work, for example) before opening up the case. This will discharge any static electricty you have built up, which could damage your computer.
   • Locate the audio plug on the back of your PC. The sound card should be in the corresponding location on the inside of the PC. Remove the sound card and put it back in. The Microsoft site has detailed directions for installing a sound card; to remove one, simply do the reverse. Once you have the sound card back in, reattach the cables you unplugged earlier and boot your PC.