Iv'e realised that my ram (Kingmax DDR3 1333Mhz 2x 2gig) runs at 1065/1066mhz when i checked on Easy Tune 6 and at the bios. I left the ram frequency on auto and changed the multiplier to x4C and the pc went onto the desktop but all my programmes and games wont work. I tried x4A multiplier and my graphics card wont work. I tried decreasing the frequency to 333/266/200. All these frequencies give me different problems. 333mhz wont have a multiplication of x4A nor x4C, only 3.2B and 2.4B which dont add up to 1333mhz, only 266mhz and 200mhz but its either my pc will freeze, graphics card wont work or programmes wont work. My specs are Intel Core 2 Quad Q9400 @ 2.66ghz, Kingston 2x 2gig DDR3 1333Mhz, Palit geforce 9800GT super+ 1gig 256 bit, samsung 160gig HDD + 1tb, samsung dvd writer. Windows 7 Ultimate 64bit. Help