Parallels Desktop is not available for Windows but there are plenty of alternatives that runs on Windows with similar functionality. The best Windows alternative is VirtualBox, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Parallels Desktop and 19 are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Parallels Desktop are QEMU, VMware Workstation Pro, VMware Workstation Player and Windows Sandbox.
Unlike Parallels, Virtualbox is free, open source and runs natively on Windows, Mac and Linux. What's not to like?