Dell OptiPlex 745 SFF Core 2 Duo computer - 1.8GHz - 2GB 80GB Sata HD - DVD-R/W & CD-R/W Combo Optical Drive.Optiplex computers are Dell's Enterprise Class computers. They are more reliable and robust than their standard consumer line and built to last. These computers make great televisions to watch on line TV shows such as Netflix and Hulu.....If you buy it without an operating system the price is only $50. This computer has no Microsoft Window operating system....If you buy it with the Linux Ubuntu version 14.0 operating system and Open Office - which has everything MS Office has to offer - the price is $85......If you buy it with fully a licensed MS Windows 7 Pro and MS Office 2010 & MS Essentials - the price is $110....Flatscreen monitor; power cords, keyboard and mouse are available for an extra charge....Virus removal or Windows 7 re-installation is $50.