Have you checked how much hard drive space you have left?
I know that my computer doesn't like it when I have 40% free space in my main drive. It could be that your laptop is getting close to being full. And seeing as it is a laptop, its the more reason to make sure you create backup discs with your work etc because laptops don't hold as much as a normal desktop PC.
So many try getting rid of unwanted programmes and files that you don't anymore can go on a data disc maybe.