HP Pro 3500 Microtower Essential Desktop PC - D8C44UT Microtower Desktop Windows 7 Professional 64 (available through downgrade rights from Windows 8 Pro) Intel Pentium G645 Dual Core 2.9GHz Processor 2GB DDR3 1333 MHz SDRAM 500GB 7200RPM SATA 3.0Gb/s Hard Drive