Website/Blog without the www - HELP

[MissChievous]

Hi, ladies.

I have a blog. It's working fine until yesterday.

See, the www.domain.com is perfectly working, but the domain.com isn't. The latter is showing a blank page with a spam link on it. I've set this up before installing WP. The domain.com should also show the same page as what the www.domain.com should.

Do you have any fixes for this? I've already tried working on the htaccess to no avail. TIA!