When I use the NVIDIA Detonator 1 drivers with Half-Life, they work OK. But the version 2 and 3 drivers cause problems. I have pauses of about a second or two between the time I take some action with the keyboard or mouse and the time I actually move in-game. For example, if I use the 'w' key to move forward, there's a pause before I move forward. When I let go of the 'w' key, there's a pause before I stop moving. Is there some Half-Life, DirectX, or Detonator setting I can change to fix this?

System stats:
NVIDIA TNT with 16MB (STB Velocity 4400)
450 MHz Pentium II
128 MB memory
DirextX 7.0a
Windows 98 with all updates

Thanks in advance for any help.