In order for you to play Thief: Deadly Shadows on Windows with minimal graphics settings, your computer must meet the following requirements
Minimum:
IBM PC or 100% compatible, Windows 2000 or Windows XP, Intel Pentium IV 1.5 GHz (or AMD Athlon XP equivalent), 256 MB system memory, 64 MB video memory, Direct3D 9.0, and Pixel Shader 1.1, 100% DirectSound 9 compatible sound card, 3,000 MB free hard disk space, Keyboard and mouse
Recommended:
Intel Pentium IV 2.0 GHz (or AMD Athlon XP equivalent), 512 MB system memory, 128 MB video memory, Direct3D 9.0, and Pixel Shader 1.1
Thief: Deadly Shadows does not support play on laptop computers.