Firstly, back up any important files
Secondly, do you have restore disks, if not, you may need to make them.
Thirdly, we need the make of the hard drive. You can find this in device manager in "disk drives" - instructions here how to open device manager -
How Do I Access Device Manager in Windows?
Does the laptop run OK afterwards. You`ll need to download, install and run the diagnostic tool for your drive. Sometimes errors can be repaired, sometimes not.
You`ll also be able to get the serial number for the drive and check if it`s still under warranty.