Windows 10 System requirements (Minimal specs)
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
Click here for Windows 10 upgrade Paths
Some PC processors and hardware configurations aren’t supported by Technical Preview.
To access the Windows Store and to download and run apps, you need an Internet connection, a screen resolution of at least 1024 x 768, and a Microsoft account.
After you install the preview, you won’t be able to play DVDs using Windows Media Player.
If you have Windows 8 Pro with Media Center and you install the preview, Windows Media Center will be removed.
The preview won’t work on Windows RT 8.1 and Windows N editions.
The preview is not available for Windows Phone.
A small number of older, 64-bit CPUs might be blocked from installing the preview.
If you’re running Windows 7 without SP1, you can only upgrade to the preview by downloading an ISO file. If you install Windows 7 SP1, you can upgrade to the preview by using Windows Update or by downloading an ISO file.