Have a look on e-bay. Some nice Dell Optiplex's are available for peanuts. Go for 512 Ram (memory) and a minimum 250GB hard drive.Zone alarm for the firewall,Avast for anti virus,Open Office for documents and the Gimp for graphics. All of which are free and stable.Hard drive and memory upgrades are readily available and the machine is broadband ready. Suggest an Optiplex 280.