dear expert mere quad core q6600 pc me ek problem aa rahi ha "dxdiag" me display pe asal approxmat memory 1266 mb ha lakin ab 512 mb show ho rha ha jo k is ka half ha is ki kia wja ha mera 512 ka externel show nahi ho raha jab k window 7 me mukammal show hota ha window 8 me tu bilkul hi nahi hota ha plzz help