CPU: Intel Core i3 / i5 / i7 processor OS: Genuine Windows 7 Home Premium Genuine Windows 7 Professional Display: 15.6" 1366x768 LED backlight System Memory: 2GB/4GB DDRIII, 2 slots (Max 8GB) Chipset: Mobile Intel HM55 Express Chipsets Video Graphics: NVIDIA GeForce GT 335M 1GB Hard Disk Drive: 320/500GB 2.5" 9.5mm SATA HDD 5400rpm Optical Disk Drive: 12.7mm Super Multi DVD RW I/O Port: USB(2.0)*2, eSATA/USB(2.0) Combo*1, HDMI, D-Sub, Mic-in, Earphone-out, RJ45, 4-in-1 card reader(SD/MMC/MS/MS Pro), Mini Express Card Slot, DC-in Jack Audio: 1.5 Watt Speakers*2, Internal Mic-in Communications: LAN: 10/100/1000Mbps Ethernet Base-T Wireless LAN: 802.11b/g/n Wireless Bluetooth: Build-in V2.1 + EDR WWAN (3.5G): N/A Webcam: 1.3 Mega Pixel Security: HDD Password, Kensington Lock Battery: Li-ion 6-cell, 5200mAh Dimension: 373(W) x 257(D) x 33~40.9(H) mm Weight: ~2.8kg (w/ODD and 6-cell battery) Please do not forget to check with our site as often as possible in order to stay updated on the latest drivers, software and games. Note: Try to set a system restore point before installing a device driver. It will help you restore system if installed driver not complete.