if you don't know how to make an XISO with XBMC, then try downloading a slayer's ISO from torrents or something (whatever you use).
burn the *.iso to a compatable disc media.
insert disc, then ftp to the IP address on the screen.
you can re-build from your ftp session.
to ftp in windows
open a run box (start, run)
type "iexplore ftp://xxx.xxx.xxx.xxx
" where xxxxxxxxxxxx is the IP address.
when it denies you access, right click on the ftp window to choose "login as"
enter "xbox" as the user and the password (sometimes this differs)
after gaining access, you will see your xbox's file system.
just drag and drop like it's any other file explorer window.
as a side note,
how is it that anything is left after formatting the HD?
this should have wiped your hd.
did you abort before it finished?