Logging on

Hello recently I had to completly reinstall my windows and now I can no longer logg on at home. The problem is that when I signed up I was using a different ISP than what I am now and now do not remember what my password is. Since I no longer get Email sent to my old email address How can I find out my password. I know that i could make another account but I would like to keep the one I have. Any help would be welcome. 8-)