I think that the windows dual-boot loader has some probs with specific USB chip sets.
I had the same prolem than rikku2000:
The flash-loader starts but immediately (under 1 second) the screen turns white and the loader was finished.
I tried all varintants (linux, native or default loader).
I tried it on two PCs, both with VIA USB chip set.
One PC runs under WIN XP Home, the other under Win 7 32 Bit, not difference in the behaviour.
I seems that not all bytes were written and after all it was not possibe to boot any Dingux-SD (hangs in the DINGUX startup screen).
I could intstall the boot-loader under Linux (Ubuntu) without probs and now my Dingux-SDs run fine...
I had the same issues with the dual-boot loader under my A320, it needs 4-5 attempts to flash the loader correctly. But then it works. With the new loader I had no chance (tried more than 10 times...)
Looking into the USBBoot.cfg results in non understandable values (EXTCLK 12 MHz, CPUSPEED 228 Mhz !?).
Maybe these values do not run with all USB chipsets.