1) Upgrade your Word Press Site when the upgrades are available.
2) Install WordPress Firewall as a plug-in to protect yourself from attacks.
—————–
If you are having a trouble, read this article http://www.theinternetpatrol.com/was-your-site-hacked-redirecting-to-itsallbreaksoftnet-or-paymoneysysteminfo-heres-what-happened/