I suppose, you won't be able to fix it that easily. Something is wrong with the keyboard and most likely you'll have to replace it. But I'd say that it is pointless. I mean, the laptop is a bit outdated so why not to get something better? There are so many options out there. If you need a laptop for doing job, here you can take a look at these laptops for quickbooks and daily accounting which can handle basically, any taks besides resource intensive ones like gaming, 3d rendering, etc.