Luckily, you can upgrade from Windows 8.1 to Windows 10 without losing your files or apps using the Media Creation Tool, which is also available for upgrading Windows 7 computers.
upgrades can always fail, so you should make a full backup and roll back in case something goes wrong
Processor: A processor or SoC running at 1 GHz or higher. RAM: 1GB for 32-bit, 2GB for 64-bit. Disk space: 16 GB for 32-bit OS, 20 GB for 64-bit OS. Graphics Card: DirectX 9 or above with WDDM 1.0 driver. Display: 1024 × 600.