HFSS 11 under Windows 64 bits (XP or Windows 7)

Can I use the same installation disk that I used for 32 bit windows to install HFSS 11 in 64 bit Windows?
Or do I need a new HFSS disk, that is specifically compiled from Ansoft for 64 bit OS?

Thanks in advance.

-Gemini

No, the software CD is the same for 32-bit or 64-bit.