If LAN adapter has disappeared, just extract it to /E/E from bootpack, the run myFix (full).
If you got KP after SoundFlower was installed, removed it, but I guess it's probably more to do with the audio kext you chose. I'd go back to do a new EDP System build and carefully choose the patched AppleHDA kext that's listed for the D430.
2Go RAM max, I suggest you get familiar with the user's guide specifications off Dell's web site.