Counter-Strike Source Settings:

In-Game:

~ Resolution: 800x600 @ 75 Hz
~ Crosshair: 1200, Green, Translucent
~ Sensitivity: 1.3
~ Zoom_Sensitivity_Ratio: 1.0
~ Model Detail: Low
~ Texture Detail: Low
~ Shader Detail: Low
~ Water Detail: Simple Reflections
~ Shadow Detail: High
~ Color Correction: Disabled
~ Antialiasing Mode: None
~ Filtering Mode: Bilinear
~ Vertical Sync: Disabled
~ High Dynamic Range: None
~ DirectX Level: 81
~ Launch Options: -noforcemspd -noforcemaccel -noforcemparms -dxlevel 80 -freq 100 -w 800 -h 600

Mouse:

~ Mouse DPI: 400
~ Windows Sensitivity: 6/11
~ Mouse Rate: 500 Hz
~ Enhanced Pointer Precision: No
~ Drivers: None

nVidia Graphics Settings:

~ Brightness: 50%
~ Digital Vibrance: 100%
~ Contrast: 50%
~ Gamma: 70%