i bought a acer laptop 5733z, i had installed the windows 7 64 bit during installation itself an error occurs on "installing updates".then i moved to put os windows xp sp3 it was installed but not wroking properly ie.,when it has gone stand by mode to normal mode display is not coming.i decided send the laptop to dealer itself ,he just put windows 7 os easily.....is the problem in cd or any setting to be done in laptop????