Go with Ubuntu Linux !
Vista has big time problems with DRM built within its kernel... displaying content that do not meets its own requirements, and will not display HD videos without distorting or bluring such... Vista is supposed to be more secure then XP Pro, however, XP pro can be just as secure as Vista if you know what your doing...
I would suggest using Ubuntu Linux or any version of Linux/gui or Unix over Windows Vista or XP, however If you are playing 3D video games that requires Windows for your video games then run Windows XP Pro... and linux/gui for the rest of your apps.
Ubuntu linux does support both 32 and 64 bit computers; and is FREE...
Good luck,
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