Posting the actual error message would have been more helpful, but if it's a driver that needs installing, it's here:
http://h10025.www1.hp.com/ewfrf/wc/s... 536&lang=en#
Before installing it, go into Control Panel (classic view), > System > click the 'Hardware' tab, then click 'Device manager.
Click the plus sign next to "Sound, Video and Game Controllers". Right-click existing audio driver and select "Uninstall".
Now install the new driver thus:
1. Download the driver update.
2. Double-click the icon for the update file downloaded in Step 1, and then click NEXT.
3. Accept the terms in the HP license agreement, and then click NEXT.
4. Click YES and wait for the update to complete.
5. Click YES to restart your PC.