Drivers/Resolution probs

Hello, I own a VAIO VPC136FM/B.

I succesfully installed Snow Leopard on my HDD (retail DVD Install, since others were not working correctly)

I have some problems, If I could get some help, would be really appreciated.

1. When I click "about this mac" it crashes (like a reboot of the display)

2. I have a NVIDIA GT425M graphic card, but it only shows 32mb of the 1GB!. When im trying to change resolution (mine is 1900x600) I cant, because theres only one option. I tried some things:
- Installing nvidia retail drivers (after install and reboot, wont let me get inside macosx)
- doing "graphics mode=1600x900x32" in apple.boot.. (didnt worked at all, its the same resolution)
- Installing the NVEnabler (nothing)
I guess I've tried all and I cant change my resolution that keeps bugging me.


thanks a lot :)