Lenovo ThinkPad Edge E545 20B2001CUS 15.6" Laptop (2.9GHz AMD A6-5350M Processor, 4GB RAM, 320GB Hard Drive, DVD-Writer, Windows 7 Home Premium 64-bit) Matte Black Screen Size: 15.6" Processor Type: A-Series Standard Memory: 4 GB Hard Drive Size: 320 GB Operating System: Windows 7 Home Premium