Dolphin don't show any graphics

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I tried Megaman 9 and SSBM.
Megaman: sound working, screen BLUE and flickering, cant get to play
SSBM: sound works, video no, only the grid for selecting player(or name IDK, never played)cant get past that.

I'm using OpenGL plugin because DirectX dont show up(yes, I will try updating DX, but i'd like a better option first).

Specs:
Celeron D 2.53Ghz
Geforce FX5500 256MB with lastest drivers(yes, its a baaaaad card, but...)
512 MB RAM.
Windows XP
USA game.

Should i try downgrading the GF drivers?

Help.
Thanks.