NX-7.5 is basically designed to be installed in Windows XP or Windows 7 (32 bit). It can be installed in Win 7 64 bit too by modifying some of its license thing, but still this way doesn't work for some users (like me).
I figured out two ways:-
First is shown in the following video.
I would recommend to use this crack (even if you have one already available in your setup)
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Second way to install it in Win 7 64 bit is :-
Since NX 7.5 runs easily on windows XP , so the best way is to turn your computer to XP mode.
You don't need to install Windows XP separately. You just have to install XP mode from Microsoft , with which you can easily convert your computer to XP mode within a fraction of seconds and back to Win 7.
This utility is given by microsoft for the applications which doesn't support Win 7 but Win XP. So you don't need to install XP separately, just install XP mode and hop to XP mode. This process/application they called it Virtual PC.
For installing follow the step wise procedure given in the following link.
