Not sure about the release time frame of Ideas NX6.4, but if it is close to that of UG NX6, then I would guess you need an older 32-bit OS, like WinXP-32.
You may be able to get Win7 to run in WinXP emulation mode and run it under that.
"Wildfires are dangerous, hard to control, and economically catastrophic."
Ben Loosli