Start your laptop in Safe Mode and run an anti-virus scan from there. If you're using a version of Windows before Windows 10, press F8 during the boot-up process and select the relevant boot option from the screen menu. (Use the Up/Down keys and then hit Enter). If you're using Windows 10, see the video below instead.
If that doesn't help, try running System Restore to take your laptop's registry back to a date before the problem first occurred.