The E6400 was an awesome laptop that I still own today, other than the dead battery the computer runs amazing still. You put a SSD in one of these laptops and you will love the performance. Mine originally came with Windows Vista, I later did upgrade to Windows 7. No drivers were released for Windows 10 but it does run Windows 10 most drivers should be builtin to Windows 10.
Graphics adapter: Intel Graphics Media Accelerator (GMA) 4500MHD
Memory: 2048 MB , PC2-6400
Display: 14.10 inch 16:10, 1440 x 900 pixel, WXGA+ LED TFT, glossy: no
Mainboard: Intel GM45
Storage: 160 GB - 7200 rpm, 160 GB , 7200 rpm, Hitachi HTS722016K9A300
Soundcard: Intel IDT 92HD71B7 HD Audio (ICH9)
Connections: 1 Express Card 54mm, 3 USB 2.0, 1 VGA, 1 DisplayPort, optional Modem, 1 Kensington Lock, 1 eSata, 1 Docking Station Port, Audio Connections: Headphone, Microphone, Card Reader: 5in1
Networking: Intel(R) 82567LM Gigabit Network Connection (10/100/1000/2500/5000MBit/s), Dell Wireless 1510 Wireless-N WLAN (g/n = Wi-Fi 4), Bluetooth 2.1
Optical drive: PLDS DVD+-RW DU-8A2S
Size: height x width x depth (in mm): 31 x 238 x 335 ( = 1.22 x 9.37 x 13.19 in)
Battery: 56 Wh Lithium-Ion, 11.1V 6-cell
Operating System: Microsoft Windows Vista Business 64 Bit