If what you have now is working and:
- Your computer hardware is less than 5 years old
- Your OS is Windows XP, Vista or Windows7
- You're good to use Delcam products released through 2010.
If you are purchasing new hardware, order a 64-bit computer with Windows7 64-bit Professional OS installed. This is the platform Delcam will be supporting in future releases.
We see no advantage to upgrading your OS unless you get new hardware.
Delcam does not support* the "Home" version of any operating system.
*NOT Supported means: The software was NOT designed or tested to run on that OS. It will probably work, but may have issues that Delcam will not resolve.
The main issue to understand is the difference between 32-bit and 64-bit versions of software, hardware and drivers. There's a lot of general information explaining this issue in this article on Microsoft's web site http://windows.microsoft.com/en-us/windows7/32-bit-and-64-bit-Windows-frequently-asked-questions.
Cad Cam Systems has written a support document "Windows7 and Delcam Software" with more technical information.