OS: Genuine Windows 7 Home Premium, Genuine Windows 7 Professional CPU: 3rd Generation Intel Core Processors Display: 17.3" Full HD 1920x1080 LED backlight System Memory: 2GB/4GB DDRIII, 2 slots(Max 8GB) Chipset: Mobile Intel HM76 Express Chipsets Video Graphics: Intel HD Graphics 4000, NVIDIA GeForce GT 640M 2GB, Supports NVIDIA Optimus Technology Storage: 320/500/640/750GB 2.5" 9.5mm SATA HDD 5400rpm Optical Disk Drive: 12.7mm Super Multi DVD RW I/O Port: USB(3.0)*2, USB(2.0)*1, HDMI, D-Sub, RJ45, eSATA, Mic-in, Earphone-out, 9-in-1 card reader(SD/mini SD/SDHC/SDXC/MMC/RS MMC/MS/MS Pro/MS Dou), DC-in jack Audio: 2 Watt Speakers*2, Internal Mic-in Communications: LAN: 10/100/1000Mbps Ethernet Wireless LAN: 802.11b/g/n Wireless Bluetooth: Bluetooth V4.0 Webcam: 1.3 Megapixel Security: Kensington Lock Battery: Li-ion 6-cell, 4400mAh Dimensions: 413(W) x 270(D) x 14~40.5(H) mm Weight: ~3.0kg(w/ODD and 6-cell battery) Try to set a system restore point before installing a device driver. This will help if you installed a wrong driver. Problems can arise when your hardware device is too old or not supported any longer.
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