This is a already built computer box with Windows 7 Professional 32 or Windows 7 Home 64 bit pre-installed. All parts in this computer box are brand new and has 1 year hardware warranty. 

Hardware specification: 

Intel i3 6100 CPU, 3.7 GHz

MSI B150M PRO-VD motherboard
        Intel socket 1151,2 DDR4 RAM slot. 6 SATA port
        1x PS/2 keyboard / mouse port, 6 USB and network port at back
        D-Sub and DVI video port

8 GB DDR4 RAM

480 GB SATA SSD, DVD burner

Thermaltake Versa H15 case with 450W power supply. Power cable. 
Dimensions ( H*W*D) 378 X 198 X 411 cm ( 15 x 7.8 x 16.2 inch)

Windows 7 Professional 32 or Windows 7 Home 64 bit pre-installed and Microsoft original DVD and license key supplied.

Free upgrade to Windows 10 professional 32 or Home 64 bit if required. 

Upgrade option: RAM, Hard drive, CPU, wireless network card and video card