hi. i see you need help getting your passwords back. fragments of files are stored on your pc indeffinently. or forever. that is one reason memory size decays over time.
there are programs you can download that will allow you to see all information that has been deleted. if you had Cain & Abel, then you will deffinatly get your passwords back.
if not you might still be able to find some files with them in there, like in the cookies.
in order to see all this deleted stuff you will need a program obviously. there are many out there, but i use advanced system opimizer pro. this can be found on thepiratebay.org
i recomend that cain and abel program. it is very handy. it stores your email and passwords so you will never forget. and if someone comes and uses your pc it will tell you there passwords too!! it can even hack wireless internet around you, and many other things like tracing the ips that are connected to your router.
very useful for hacking people on xbox live too