I downgraded from Windows 8 to 7 due to some high disk and cpu related problems and after downgrade the problems were solved and initially my laptop was running finw with Windows 7 and since it was latest i upgraded it to 8 but after downgrading I loast all my drivers and installed drivers from the two year old factory disk of my latop and evrything was installed and the pc was working fine and after a day i tried to play battlefield 3 which was working fine in windows 8 but when i opened it the screen flashed three times(unusual in my laptop) and the game came up and I began playing but I also is suffering from 5 fps drop in gameplay than usual. why is this happening ? Is it because of a driver problem or some other problem ? Kindly help me.