Dell Dimension 5150 Base Unit PC that is loaded with Windows 7 Professional on a 320GB hard drive, with a DVD recorder capable of creating cds and DVDs, it has a Wireless usb dongle for Wifi Internet access, it has had an upgraded dual core 3.4GHZ cpu inside, with 2gb of ram that can be upgraded if required, it has a PCI express slot if you wish to use a seperate graphics card, it has onboard sound card, it's in excellent working order and comes with a recovery dvd if you wish to put XP back on the system. This base unit doesn't come with keyboard mouse or screen however it will all be seen working when you come to view it. If you need a screen , mouse or keyboard they are available for extras.