I am planning to remake my pc. I am going to buy a Windows 7 licence. I whould like to know if the windows 7 core is 32 and 64 bit (choosing on installation phase) or we must buy the correct version? Are the drivers writted both for the 32 and the 64 bit version? Must we looking for components that have both version drivers or windows 7 drivers include both (32-64) versions? Thanks.