Windows 7 Recent computer issue

Hello,
From this monday my laptop becane a great pain in the butt. At first, windows explorer started freezing and crashing after 20 min of using the computer, i will either restart the computer or wait for explorer to restart( usually i have to restart it manually) this night i tried to scan my latop with malwarebytea, which found a lot of Pups.but afther that, things got even worse. Now i have to wait a very long time on welcome screen and after that i see a black screen with a mouse screen on it. Al ctrl delete helps. But explorer crashing did not go away, computer runs perfectly fine during those 20 min. Sometimes bsod happen