Can't login into horizon program

I just created a account tried all possible problems such as turning off firewalls, allowing horizon as an firewall exception. signing up as a diamond member even uninstalling avast from my computer but nothing not even running as a administrator wont let me login to my account. Ive double checked and even triple checked my password and username hense im on the site sending the concern. Please help. Ive been a previous member before and I love the work you guys do.
also I even flushed my dns any one else having this problem and if so how DO I fix???

Try downloading Horizon through this link: