more info. What point in Toast Root did you get this !
Also, like above, did you download the EvoRecovery zip and extract it to your desktop? and follow all instructions?
Also, if possible, always make a backup of your sdcard to your computer before doing any of these things.
However, If you did everything correctly, and it is still doing this....
I think you still could get to your SDCard, if there is anything on your SDCard, (unless it is the EVO SDCard issue)... If you can get to your sdcard thru usb or by taking it out AFTER turning off phone. You could either make your Backup of the card, or put your Backup back on your Card and start over.