SSLEAY32.dll not found

- windows vista 64 bit

- PostgreSQL 9.0

I had been working on fixing my PostgreSQL version 8.3 for hours, the problem was that the server would not listen.  I tried to follow tutorials from archives.postgresql.org but they were all too complicated for me to understand.  After I couldn't figure out how to do what the archives were telling me, I did a system restore.  When that didn't work I got fed up and uninstalled and then deleted every PostgreSQL folder and file on my computer.  This was version 8.3 when I did this.

Now I installed 9.0 and when I open pgAdmin III I get the message "This application has failed to start because SSLEAY32.dll was not found.  Re-installing the application may fix this problem."

What have I done?  Are you able to explain in layman's terms how to fix it?  I seriously googled and read posts for over five hours on how to make the server listen, and everything sounded like a foreign language to me and none of the steps I attempted to follow were fixing it so that's why I freaked out and tried deleting everything and installing a new version.  I'm afraid I might have made things even worse now :-( 

Thanks for reading, please help if you can.