Cannot login

I just installed WP on machine running IIS 8, Window Server 2012 (EC2 on AWS) through WPI (Window plateform installer).
Every thing went fine until in DashBoard \General Setting I set urls to https://mysite.com/Blog in both textboxes changing it from default https://localhost/Blog. At this point I am asked to login. I gave login credentials but no sir, it will not allow me . Tried everything but failed. What to do next??? Clean install again also seems risky? Should have I used Brandoo WordPress for windows?
Any solution please.
Thanks