cannot access admin page!

help! i took down my website (sportspie.com) a few months ago, placed it in maintenance mode, with a message directed to users logging in to the site. i just received an email from the website host (register.com) that the site has been suspended because of too much spam and possible malware. now, i cannot log in to the admin page (sportspie.com/wp-admin) to clean up the spam. i can get to the admin log-in page, but it takes me to the actual page on the site displaying the message to users. register.com has been useless! and, they are going to suspend the account in 24 hours if i don’t address the problem. can anyone help me get to my admin page so i can clean up the spam. thank you.