if you look in your temporary internet folder you'll find the cookies that you are looking for.
this will (sometimes) but not allways have the password in the folder,
it probably is possible to un-encrypt the cookie, but you'd need to know what method was used to encrypt it in the first place. many encrytion methods are destructive so that they are not reverse engineerable and most reverse engineering attempts actually relly on trial and error taking a string, encrypting it and comparing it to the encrypted string from the cookie...
in short. yes it is possible... but...
it is troublesome, difficult, not exact takes along time and it's always far easier to press the forgotten password button.