Moved to another country- account gets locked

Hello i moved from USA to Sweden so my ip adress is changed.. Now when i login on my account the account gets locked. I get a mail like this:

Due to suspicious activity, the Battle.net account ********** has been locked. To restore access to this account, please follow these steps:

Step 1: Secure Your Computer

In the event that your computer has been infected with malicious software such as a keylogger or trojan, simply changing your password may not deter future attacks without first ensuring that your computer is free from these programs. Please visit our Account Security website to learn how to secure your computer from unauthorized access.

Step 2: Secure Your E-mail Account

After you have secured your computer, please create a new password for your e-mail account since it may also be compromised. Be sure to check your e-mail filters and rules and look for any e-mail forwarding rules that you did not create. For more information on securing your e-mail account, visit this Support page.

Step 3: Choose a New Password

You must change your password in order to resume using this Battle.net account. Please click this link to choose a new password:

(LINK)

*Note that your former password no longer grants access to Battle.net account management, World of Warcraft, or any other login-protected Battle.net account service.

If you still have questions or concerns after following the steps above, feel free to contact Customer Support at http://us.blizzard.com/support/article.xml?locale=en_US&articleId=20606.

Sincerely,
The Battle.net Account Team
Online Privacy Policy

So what should i do to avoid future lockings? this is the second time my account gets locked
btw i don't have any keyloggers on my computer -.-