okaay like thats the picture i want to use.
and i want to make it black and white except for my nail polish..
can i do that with psp x?

Yes...
Copy and paste the image into a new document (so you have two).
On one, grayscale it (or use a new layer filled with white/black set to color). Make sure it's still RBG color mode. On the other, erase everything but your nails.
Copy the nails onto the other picture and move them until they cover exactly.

you could also:
select your nails
click selections>>invert
click adjust>>hue&saturation>>colorize [drag the bar on the right side all the way to the left]