You will need to flash both the fiasco image and also the eMMC image - I take it you *had* NITDroid installed as you are flashing with Mido.Fayad's fiasco image - and the only reason for this (as far as I'm aware) is to allow you to install NITDroid. On this basis I would guess that you either went to uninstall or upgrade your NITDroid install and instead of cleaning out only the Android /home you also cleaned out your own Maemo /home, resulting in your reboot loops and the black screen with purple bar. I'm surprised that you managed to flash fiasco successfully from a 64bit W7 install to be honest, as 64bit W7 is supposed to be incompatible with Maemo-Flasher. Seriously, Linux LiveCD to boot from and flash both fiasco and eMMC without rebooting in between them. The reboot switch is the Code: -R so on the first flash, omit this from the command you input into the prompt. This should clear up any problems that you have, but will lose all the data you have in your phone. And I know it's tempting, but NITDroid is not for people who are not massively technically minded. It takes a modicum of expertise to install, uninstall, apply fixes, set up APN's, etc etc so if you are not that way inclined, my best advice to you is to leave it well alone....
-R