In order for you to play Serious Sam Classic: The First Encounter on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows 95 OSR2, Windows 98, Windows 98SE, Windows ME, Windows NT 4.0 (with Service Pack 5), Windows 2000, Windows XP, Windows Vista or Windows 7 operating system
Processor (CPU):
AMD K6-3 400MHz, Pentium II or Celeron-A 300MHz
Memory (RAM):
64MB
Graphics Card:
full OpenGL compliant 3D accelerator
Hard Drive:
600MB free hard disk space
Sound:
100% Windows compatible sound card
In order to play Serious Sam Classic: The First Encounter on Windows with maximum graphics settings, you need a computer with a configuration no worse than the following
Processor (CPU):
AMD Athlon 650MHz or Pentium III 650MHz range processor
Memory (RAM):
128MB
Graphics Card:
nVidia GeForce256 or TNT2 ultra, PowerVR Kyro, S3 Savage2000, 3Dfx Voodoo3, ATI Rage128 pro
Hard Drive:
700MB free hard disk space
Sound:
Creative Labs SoundBlaster Live