The best thing to do is to backup your data and repair your OS (or reinstall it). Since you are using a laptop, you may need to disconnect the hard drive and connect it to a desktop PC, as a secondary storage drive. If your laptop is under warranty, I suggest you to contact the seller because opening the computer will void its warranty. Once all data is backed up, boot from a Windows installation drive and reinstall the PC.
If you prefer, you can first try to use the Repair function which will not harm the stored data, but may not solve the issue, depending on the problem.
Hope this helps