I mainly specialise in laptops these days, but I do have a few part exchanged towers with fresh windows 10 installed with Office and SSD, wireless adaptor at £75 each (monitors, keyboards mice optional extra)

Windows 10 still has some life left for those on a budget

although updates will no longer be available, Microsoft have had 10 years to perfect any vulnerabilities

provided you are using a 3rd party anti virus live Avast or Avg and google chrome, you should get another 3 years out of windows 10