Quad core CPU: AMD Phenom II X4 955, Intel Core i5-750 Memory: 4 GB RAM
Always use a trusted antivirus. Compressed files from unofficial sources can sometimes trigger false positives or, in some cases, contain unwanted bloatware.
DirectX 11 graphics card with 1GB Video RAM: AMD Radeon HD 5870, nVidia GTX 480 Important Considerations Before Downloading
Windows XP Service Pack 3, Windows Vista, 7, 8 (32bit/64bit)
Below is a comprehensive guide to understanding the game, why compression matters, and what you need to know before downloading.