Dell Optiplex, Intel Core 2 Duo 2600 MHz, 500Gig Serial ATA HDD, 2048mb Memory, DVD ROM, Windows XP Professional-Power Cord (Certified Refurbished) Dell Optiplex Mini-Tower Computer Specs: Core 2 Duo 2.6GHz CPU, 2GB RAM, 500GB Hard Drive, DVD Player Runs: Windows XP Professional x32bit Includes: Power Cord & Dell Restore CD Windows XP is meant for older games and software no longer supported on newer Windows. Most internet sites will not work with Windows XP and you should buy Windows 7 or above.