hi all, i have a weird problem, cant find a fix for it, when i play any game, after i finish it or just close it as soon i open it , i get lag on desktop , its like when you move windows on desktop it goes slowly like ghosting its like i have very low ram , its really weird, even when i type this text here it goes slow, after i restar its fine, i tried to reinstall windows 8.1 same problem , i have no idea whats causing it