Everyone who has trouble reflashing their n900 in Windows:

Get a linux live CD, for example here: http://www.ubuntu.com/download/ubuntu/download

Look on the internet for tutorials if you do not know how to boot ubuntu from a live CD on your PC

Then follow this wiki for linux exactly: http://wiki.maemo.org/Updating_the_t...firmware#Linux

If you have messed up the 32gb flash you need to follow the steps: "flashing the emmc". You need to do this first before flashing the main firmware. WARNING: this will erase all data on the 32gb flash.

Again make sure you follow the steps carefully (I know its long and technical so how badly do you want your N900 back?) because if you don't read everything and follow it exactly then it is very likely NOT to work.

If you still can't get it to work then it is best to send your device to Nokia to get fixed.