Processor - 1ghz or faster
It is NOT recommended to just have the min. requirements to run Windows 10. For example, if you run a 64 bit machine with a 1 ghz cpu, 2 gb ram and a 20 gb hard drive, you will run into performance issues.
If you want good performance, I recommend building a system around AMD's Ryzen 5 cpu. You can visit pcpartpicker.com and build a decent system for under $700.
> Requirements to run Windows 10
If you never installed a copy of Windows before, you will be happy to know that installation is very easy compared to older versions. Sometimes older versions of Windows would crash during installation.
> What you need to install Windows 10
1. USB thumb drive with at least
2. The Windows ISO tool, free from Microsoft.
3. Windows Activation Key. You can buy this from Microsoft, Newegg and type the key in during or after the install is done. Note that newer generation motherboards will store the product key in the bios. Should you lose the hard drive for any reason, the Windows installer will look for the embedded key in the bios.