With those specs, no wonder why you're having so much trouble running FS2Open. My family's PC has about the same processor, 384MB of RAM, and an GeForce 2 32MB card, and I'd never even consider trying to run the SCP on it. From everything I've heard and experienced, you need a minimum of 512MB of RAM to prevent XP from bogging things down, and that's before you try to run anything even remotely graphically intensive on top of it. The reason you may not be seeing the SCP's graphical enhancements may be because your video card (which, although I don't know much about system hardware, I'd venture to say is an integrated card) doesn't support them. I can certainly say that you shouldn't be running adveffects.vp with that setup; removing that would eliminate the super-hi-res shockwaves and prevent those crashes, at least.
Regarding your original request, if no one else takes care of it beforehand, I can give the conversion a whirl this weekend when I return to the computer on which I have FREDOpen installed.