Installation problem (Windows)

I installed, accepting the program selected password. I immediately realized 
that the generated password would be difficult to use so I clicked back and 
changed it. Upon running the program it became apparent that going back and 
changing the password does not change the password. So I uninstalled it and 
attempted to reinstall. It will not let me reinstall because I don't know the 
password. I deleted all of the directories it created and removed all registry 
entries. I still cannot install because it want the original password. Any thoughts?

Thanks,
Bill