You mean ping hiccups in games? If so, stop the Wireless Zero Configuration.
To Disable: START->RUN->services.msc, locate the service and stop it.
Note: If you disable the service and restart your PC, you won't connect to the network (only happpens if XP is managing your wireless connections). Just stop it when you want to play games. To get around this, you'll have to configure your card in "device manager" in order to connect to some specific network without XP.