Well, it's probably not the sound card either way. Ma be a bad driver
. The laptop should have came with one or two installation discs. Go to control panel>add remove programs, and uninstall the sound driver (should pe something like hd audio codec,, had audio software, hd audio driver...) and uninstall that. Use your laptop cd's and then reinstall the driver. The issue can go deeper and be a windows related one though. Try the driver first. Oh, you might want to uninstall that from windows safe mode.