How to upgrade your Windows (32 bit) to Windows (64 bit) for free?

Now that Microsoft has officially released the 64bit of Windows , what is more interesting is you can upgrade your 32 bit OS to 64 bit for free (you need to order before July 31st) - yep its true - for free - nada, zilch, nothing. But, heh heh yes, there is no free lunch in life. To upgrade you give up the rights to your 32 bit OS and must own a 64 bit CPU (e.g. my media center has a AMD 64 Athalon). More importantly you might not have drivers for all the hardware - is this important? Yep, it is very important actually because the 64 bit version will *not* support 32-bit device drivers and will not run any 16-bit applications.