WordPress is the most popular CMS around, so it’s a big target for hackers. Be creative with naming your passwords. You can check out the 25 Worst Passwords in 2011. If your password is on this list, you might want to change it.
Another precaution to take would be to sign up for a Sucuri Account. You can scan your website to see if it is infected with any malware on their website. If it is, you may want to remove the infected file.
If you have an account with Sucuri, you just have to give them your FTP information, so they can quarantine your infected file, and replace it with a good one. You can get an account from them for as little as $89.99/year.