HP Pavilion a6537c Core 2 Duo E7200 2.53GHz 4GB 640GB DVD&plusmn;RW Windows Vista Home Premium HP Pavilion a6537c Core 2 Duo E7200 2.53 GHz Mini Tower PC General Features: Microsoft Windows Vista Home Premium pre-installed w/COA Intel Core 2 Duo E7200 2.53 GHz processor 800 MHz Front Side Bus Socket 775 4 GB DDR2 SDRAM (expandable up to 4 GB) 640 GB SATA hard drive 16x DVD RW DL drive with LightScribe technology No floppy drive 56K modem Integrated 10/100 Base-T networking interface