Windows XP 64-bit, a virtual minefield? - If that isn't a virtual minefield I don't know what is.
You risk to go from a perfectly working system running 32-bit Windows XP, to a non working 64-bit Windows XP and lose your 32-bit Windows XP product key in the process without the ability to go back. To further frustrate end users Microsoft makes very clear that the installation of Windows XP 64-bit will void any support with your PC manufacturer. One free support call will be provided by Microsoft for any installation-related issues whereas additional calls to Microsoft support will be available on a pay-per-incident basis. If that doesn't convince you to steer clear of Windows XP 64-bit for now you must either be really foolhardy or be feeling exceptionally lucky today,