Thank you for your reply,,too sad i can't make it work when i try to close and save it it says error writing  file or directory doesn't exist i follow all the instruction above..

pls enlighten me  did i type this correctly 

nano etc/default/grub
(there some message on tool bar saying [directory 'etc/default' does not exist]
Change GRUB_CMDLINE_LINUX_DEFAULT="quiet" to GRUB_CMDLINE_LINUX_DEFAULT="quiet pci=noaer"
 after pressing CRTL+X it say error writing file or directory doesn't exist..