Grand Theft Auto: Vice City uses Microsoft DirectX 9.0.

Supported Operating Systems are:

Windows 98
Windows 98 Second Edition
Windows Millennium
Windows 2000 Professional (Workstation) plus Service Pack 3
Windows XP (Home and Professional) plus Service Pack 1

The following operating systems are NOT supported:

Windows 95 (any version)
Windows NT (any version)

Minimum Hardware Requirements

800 MHz Intel Pentium III or 800 MHz AMD Athlon
or 1.2GHz Intel Celeron or 1.2 GHz AMD Duron processor
128 MB of RAM
8 speed CD / DVD drive
915 MB of free hard disk space
(+ 635 MB if video card does NOT support DirectX Texture
Compression)
32 MB video card with DirectX 9.0 compatible drivers
("GeForce" or better)
Sound Card with DirectX 9.0 compatible drivers
Keyboard
Mouse

Recommended Hardware Requirements
Intel Pentium IV or AMD Athlon XP processor
256(+) MB of RAM
16 speed CD / DVD drive
1.55 GB of free hard disk space
(+ 635 MB if video card does NOT support DirectX Texture
Compression)
64(+) MB video card with DirectX 9.0 compatible drivers
("GeForce 3" / "Radeon 8500" or better with
DirectX Texture Compression support)
DirectX 9.0 compatible sound card with surround sound
Gamepad (USB or Joystick Port)
Keyboard
Mouse