Well that's good with no AV detected, but you still my be infected with malware. Download Malwarebytes, SuperAntispyware, tddskiller ... all which are free and run full scans. This will take some time for the full each full scan to complete. Then defrag your hard drive using Auslogic disk defragger, also free. Once the system is bug free and defragged, then we need to check for driver updates and for that we'll need the full make and model of your notebook.