The optimal hardware configuration varies depending on what you will be using windPRO for. Below are some general pointers.
A multi core CPU running at 2 GHz or more on each core is recommended. Although not all windPRO calculations utilize multiple cores, Windows does and as such you may experience greater overall performance, since one core can be used for windPRO and the remaining core(s) for Windows.
For creating 3D-animations, using the 3D-animator module, a 3D-accelerated graphics adaptor is required. Otherwise most on-board graphics adaptors should perform satisfactorily in windPRO.
Memory / Operating System:
Depending on your operating system a minimum of 2 GB RAM is recommended. Generally, Windows Vista and 7/8/8.1 use more memory than Windows 2000/XP. If you are going to create very large Photomontages 4+ GB is recommended. Note that in order to utilize more than 3 GB of memory, a 64 bit operating system is required.
Note: If you are using Windows XP 64 bit a multi core CPU is required!