Trouble

I installed wordpress first via uploading it to the file manager via hosting. Then, I came to know that I can aslo set-up locally . So I deleted the wordpress files in the file manager( i installed with a user and pass and it worked earlier) but this time I am unable to get it running via wampserver.
I forgot the initial username and password with which I setup my wordpress page. Can anyone suggest what shall I do to get the page running?