Basically, if your PC can run Windows 8.1, you’re good to go.
If you're not sure, don't worry—Windows will check your system to make sure it can install the preview.
Processor: 1 gigahertz (GHz) or faster
RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)
Free hard disk space: 16 GB
Graphics card: Microsoft DirectX 9 graphics device with WDDM driver
A Microsoft account and Internet access