How to calibrate a monitor of a laptop properly? Hmm..this is what happened when I try.

I use the dpreview scale to see if I can see all the squares. I find that my extreme white and black (abc,xyz) isnt very clear. I tried the adobe gamma setting on my control panel and ticked the single gamma box. I slided the slider but I dun see any difference. I also dunno how to adjust contrast for my laptop. My laptop is a Compaq Presario 2100. Anyone can help me out? =D Thanks!