Windows 7 Professional, Dell 745 Optiplex Desktop Computer, Featuring Intel’s Powerful & Efficient 3.4GHz Pentium D Dual Core CPU Processor, 500GB Ultra Fast 7200 RPM SATA hard drive, CDRWRW/DVDRW SATA Ultra Speed Drive, 4GB DDR2 Dual Interlaced High Performance Memory, Providing Power for Today or Future Needs, Wireless Capable (Adapter Sold Separately)