Your CPU is a 64 bit.
You can not uprade xp32 to W7 64 bit. You have to do a clean install. Well actually I dont even think you can update xp to 7 period so I am not sure what you did.
If you did a clean install of windows 7 64bit then it will say 64 bit. You did not install the 64 bit version.
got it...thank you.