HP Probook for Business with Windows 7 Professional, 15.6" WLED Backlit Screen, Intel i7-4500U Processor, 16GB DDR3, 1TB HDD, DVDRW (with bonus Win 8.1 Pro included) 15.6-inch High-Definition LED-backlit Anti-Glare Screen 4th Gen Dual-Core Intel i7-4500U Processor (boost up to 3.0GHz, with base 1.8GHz) 16GB DDR3 Memory / 1TB Hard Drive Super Multi-DVD Burner / Intel HD Graphics 4400 / HDMI / Webcam / Bluetooth 4.0 Windows 7 Professional 64-bit (additional Win 8 Professional included)