Can you run unix and window 7 on same computer?

Of course you can as far as you have drivers for OSes which are compatible with your PC.
You can do it in two ways. First is to install two separate systems on the same computer and boot the one you need. Second is to use virtual machines ether under Windows or Unix. There is a third way when you can have installed two systems on the same computer and still use virtual machines, for instance, if you have access windows files from Unix.