XP to Windows 7

CIS 3.8.6xx running Win XP Media Center 2005 32 bit.

I am going to upgrade to Windows 7 ultima 64 bit.

What version do I need to use for Win7?

Thanks

You need the 64 bits version for Win 7 64 bits. Windows 7 is not officially supported yet but it works all the same. I ran CIS in various version successfully on Windows 7 beta, RC and RTM (32 bits).