The sound problems may be caused by the driver, you need to change the driver from Realtek,
to the normal/generic high definition device driver. Many HP computers seem to run into this problem. Below is how to disable and/or delete the Realtek driver. Depending on which you choose to do.
IMPORTANT NOTE: Before making the changes below, you may wish to create a restore point. This will allow you to revert back, to a point prior to the changes, should anything not go well.
Part 1... Disable the Driver.
1. Go to "Device Manager".
2. Click on "Sound Video and Game Controlers".
3. Right-click the "Realtech High Definition Audio Device".
4. From the list given, choose "Disable" (ignore the warning you are given).
5. Again right-click on the "Realtech High Definition Audio Device".
6. In the list given, click on "Update Driver Software", then click "Browse Computer for Device Software" and then click "Let me pick from a List of Device Drivers on my Computer".
7. From the device drivers list that shows up, click "High Definition Audio" (Make sure it is NOT the Realtek one) and then click "Next" (again ignoring the warning that pops up).
8. Now click "Yes".
9. At this point it should ask you if you want to Restart/Reboot the computer.
NOTE: If you don't reboot/restart the computer now, and follow the instructions in 'Part 2', the driver will revert back to the Realtek one the next time you reboot your laptop.
Part 2... Remove and Replace the Driver.
1. After you have rebooted, go to "Control Panel" and go to "Programs and Features".
2. Locate the "Realtek High Definition Audio Device", right-click on it and choose "Uninstall".
You should not have the problem anymore. Just remember then the system will also not use the Realtek audio for anything now.