You Can Request The Laptop to be Changed to Windows 10 from Windows 7 if it is Possible to be done on model you Desire at the time of Purchase Thank You 
BrandLenovo
ModelThinkPad W520
Processor

Intel® Core™ i7-2760QM (2.40GHz, 6MB L3, 1600MHz FSB, 45W)


Operating System

Genuine Windows® 7 Professional 64-bit

Hard Disk

500GB ( SATA)

Memory / RAMUp to 32GB
RAM speed1333MHz
Memory Type8GB INSTALLED DDR3
Optical DriveMultiburner
KeyboardImproved ergonomic design, ThinkPad UltraNav multipointing system, including TrackPoint pointing device and larger multitouch touchpad with flush design, larger Esc and Delete keys, separate microphone and speaker mute buttons with LEDs, VoIP Fn+F6 hotkey combination, LEDs added to CapsLk key, power-on button and fingerprint reader
Graphics CardNVIDIA® QUADRO® 1000M 2GB VRAM with 96 CUDA CORES NVIDIA® QUADRO® 2000M 2GB VRAM with 192 CUDA CORES
Available Integrated CommunicationWWAN ,Bluetooth 2.1, WiMAX, WLAN (OPTIONAL)
Supported WLAN CardIntel® Centrino® Advanced-N + WiMAX 6250 (Kilmer Peak) 2×2 AGN


Supported WWAN Card

Ericsson HSPA + WWAN Minicard (F5521gw)

LeadCore TD-SCDMA WWAN Minicard (LC5730D)

Huawei EV-DO WWAN Minicard (EM660)

WebCam720p HD
Microphonedual digital microphones


Dimensions14.68in x 9.65in x 1.26in -> 1.41in

372.8mm x 245.1mm x 31.8 -> 35.6mm

WeightsStarting at 5.95lbs (2.7kg) starting weight with optical 
DisplayHD, HD+, FHD 15.6 inch, 16:9, LED
USB Ports2 USB 3.0 ports, 1 Powered USB 2.0
eSata Port1 eSATA port/USB2.0 Combo
Other ports and slots34mm ExpressCard and mm C Smart Card Reader (optional)