when i CTRL-ALT-DEL - a window pops up, i go 2 performance and the PF Usage of always around 86.9, sometimes 100MB, sometimes 90.0MB. - how do i reduce the usage of that so that it comes down to about 50MB?? i ended some processess and i already have ended few services and startup, what else can i do??? and what is the PF Usage? what does it do? and whats it for?