Alright, try this:
1. Download and install
Driver Sweeper
2. Download the latest driver from HP for your audio device
3. Click Start Menu
4. Right Click My Computer
5. Click Manage
6. Click Device Manager from the list on the left
7. Click the + next to Sound, video and game controllers
8. Right click your Realtek device (I assume it's Realtek?)
9. Click Uninstall
10. Check the box to Delete driver software for the device if there is one
11. Click OK
12. Restart your computer in
safe mode
13. Run Driver Sweeper, select Realtek - Sound drivers, analyze, clean
14. Restart your computer
15. Install the latest Realtek drivers