particulator

I've tried that, but it tells me i don't provide enough information

You see, I had this gmail account and forgot about it for a while, but now i need it and i don't remember the pass. I've done some research and apparently it's possible to get old passwords back through Cain and Abel as long as you're using the same computer. Googling doesn't help much at this point. How would one distressed fellow go about doing such a thing?