I found my old laptop and its very slow when it comes to startup and opening applications but it works fine when the application opened. i decided to factory reset it because it has so many viruses (from porn obviously) but i cant because ill need some kind of cd which i dont have so instead i installed malware bytes to delete the viruses, after i deleted the viruses (3000+) the startup and opening an application seemed to fasten up a bit but all the games and application are now VERY slow, i played terraria on it back in the day and it was fast but now it became super slow, i downloaded minecraft to see if its just terraria whose slow, but noo i cant even play minecraft its super laggy its unplayable. What have i done? The laptop is a Dell Latitude D520