The miminum specification for Ghost Recon is as follows -

CPU - Pentium II 450 MHz processor or equivalent
Memory - 128 MB of RAM
Operating System - Windows 9X/ME/2000/XP
DirectX - DirectX 8.0 or higher (included on CD)
Video Card - 16MB DirectX 8.0 compatible 3D card
Drive Space - 1GB minimum hard drive space
CD-ROM - 4X or better
Sound Card - DirecX 8.0 compatible sound card
Internet/Network - TCP/IP connection at 28.8 KBPS or faster