Hi Alex,
try accessing the Device manager, then your sound device, right click for properties, look for driver along the top and click that. You should see a button to 'roll back the driver' and this will roll back the driver to the previous version which worked.
I forgot to mention that if the above fails to work then try finding your laptops support page. Laptop drivers are almost always supplied by the manufacturer so you need to access your laptops driver page.
If your having trouble finding it then post the make as well as model and we'll find it for you.