Welcome to the forums, newcomer!
You've posted in the Windows 10 section. Are you asking to fall back to Windows 7? Speaking of which, did you upgrade to Windows 10 using the internal upgrade path? If so, reinstall Windows 10 after creating the bootable USB installer using Windows Media Creation Tools.
Memoryleak is what causes the disk, memory or CPU or all of them to be at 100% usage, which is a sign of the OS or the OS installer being corrupt.
Regardless of being on a PC or desktop, make sure your BIOS is up to date. Might want to pass on the specs to your system for good measure. It could also be that your platform is too old for Windwos 10.