F1 and F2 Binding Problem
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To be able to bind your F1 and F2 keys: Go to your Half-Life (or Counter-Strike Retail) directory, open the "valve" folder, open the "cl_dlls" folder, and rename the file "GameUI.dll" to something else (i.e. "GameUI.bak"). You should be able to bind your F1 and F2 keys again.