heres what i have a dell inspiron 6000 1.3Ghz celeron M, 40gb HD (160 External HD), 256mb or RAM, DVD-ROM, CDRW, (Lite-ON External DVD burner.) What can i do to increase performance on this? are there things i can do? i was thinking a RAM upgrade looks most needed, but how do i know what one is compatible with my sytem? also, is there anything non hardware, that i can do to make this as fast as possible?