just bought some "Corsair CMZ16GX3M4A1600C9 16GB 1600MHz CL9 DDR3 Vengeance Memory Four Module Kit" for £50 from amazon when it was on offer (now £60+) for a new pc build. to make use of all this memory will i have to install the 64 bit version of Windows? i have windows 7. i read somewhere that windows only uses i think 4GB, i assume this is 32 bit version.