Acer Desktop Computer Intel Celeron Quad-Core 2GHz,4GB Ram,500GB HD,Windows 8.1 (Certified Refurbished) This Certified Refurbished product is certified factory refurbished, shows limited or no wear, and includes all original accessories plus a 90-day warranty. With Incredibly fast Intel Celeron Quad-core 2 GHz Processor The 4 GB DDR3 SDRAM and 500 GB of Hard Drive Disk Space you will have plenty of memory to accelerate your tasks. This machine is equipped with Windows 8 Windows 8.1