Error when starting SMG

[Dinnes]

Hi,
I've been trying to play Super Mario Galaxy on my dad's PC:
2GHz Core 2 Duo with Vpro
6GB DDR2(of which 3 can be accessed, 32 bit Windows)
Point of View 9400GT 1GB
Windows XP Pro SP3 32-bit

When loading the game in R3661, I first get this message:

I don't understand how this could happen, because all other programs were closed, and according to Task Manager only 250MB was used.
After that I got the classic Windows error(Send/Don't send) and it closed

I've played Zelda WW a few months ago on it, and it worked perfect at full speed. Mario Kart Wii worked too, but a bit slower. I currently don't have these games, I'll test if they error too ASAP.

This is the error log:

Unhandled Exception
Code: 0xC0000005
Call stack info:
Dolphin!0x0061B629 : ?
Dolphin!0x0061B696 : ?
Dolphin!0x0048DE48 : ?

After googling it I found some other people had the same error code with other games, and found the solution of disabling Dualcore, which didn't help for me.

Suggestions, anyone?