I used the D430USB file on the old guide and it worked... on my D620 that is.
I only got this notebook for about 5 hours so I haven't really got the chance to test it much, but so far I've been able to get it to load SL pretty good, no wifi or any accessories yet though (hell I don't even know what wifi I have, didn't even bother to check, i just disable it in the bios).
At any rate, give that a shot, you don't need a mac to load the D430USB file on a USB, i did it in win 7 lol.