You'll need to give a little more information rather than "tried to get stock ROM".
What did you do, what did you flash, are you S-On or S-Off? Have you somehow wiped the /system partition? Do you have a custom recovery installed currently?
Have you even unlocked the bootloader?
EDIT: I have to go now. I'm not sure what situation you're in. I don't normally suggest people use Toolkits and the like, but if you are in difficulties, in the first instance do a search (I doubt if you are the first person to have been in whatever position you are in). If you can't sort yourself out from the results, then have a look at this thread
Never, ever conform