mere pass windo 7 install hai laptop main mgr aik masla kuch din main aa raha hai mere pass k windo start hote hi windo media center open ho jata hai her cheez ki extantion change ho gayi hai jo b open karta hun windo media center open ho jata hai agr us ko close b karon tu chand sec main pher windo media center pher se open ho jata hai kisi bahi k sath agr yeh masla pehle aya hai tu plz help me