I read it's a laptop but without make, model and age I may give incorrect advice.

Window 7 laptops are now quite old and the most common issues I find are:
1. The laptop was used over time without vent and heatsink cleaning. Fix? Clean the machine vents, fans and heatsinks.
2. The machine has malware or more. Fix: Varies from running scans and removers to resetting the PC to factory conditions.