Need help with DupliVerts!!

Hi, I was working wit dupliverts, I wanted to apply it, when it was applied and I modified one of the copies, all the objects changed exactly the same.
can someone help me???

it sounds like they are linked. select all of them, and press ctrl U to unlink them. if that doesn’t fix it, it may mean you didn’t successfully apply your modifier.
(edit) try hotkey ctrl shift A ( make duplis real )