I used google and the first link was Amazon at http://www.amazon.com/Dekart-SIM-Card-Reader-Windows/dp/B0045BIUGG
It claims all (you bet they mean xp to and both 32 and 64 bit.
But at such cheap prices I doubt any of them give you support.
I would like to buy a SIM card reader with software that would work on a Windows 7 bit 64 system. The ones that I have looked at work only on 32bit systems. Can you please recommend one that will work.