I dont think its a problem with his system at all..... Halflife has a problem in Direct 3D that causes the mouse to lag slightly when moving, I dont know why but it has happened to me from the time I had my Voodoo 2 to my Ti4600 now. And I believe that if he had a GF FX5900Ultra he would still get this lag.
Anyway Change over to Open GL and you should be fine, you should also notice better frames.
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