Install VirtualBox from here:
https://www.virtualbox.org/wiki/Downloads
1- Install MAC (OS X) version on your laptop, then VirtualBox Extension Pack.
2- Install Windows 7 32 bit on it.
3- Install VirtualBox Guest Additions on Windows 7,
Configure VirtualBox from Setting with the appropriate RAM and CPU's and Video Memory 128 mb display, then Settings --> USB --> Enable --> USB 2.0 and click on Add new USB filter set to empty settings (the one with dot)
4- Install DiagBox on Windows 7 which is on VirtualBox as per the instructions.