ummmm ON TOPIC ......... what account was it trying to protect? His LiveForSpeed Web account or his LiveForSpeed Game account?

If this activity continues you can contact the persons isp and tell them that someone is trying to hack your account from their network.

I did a quick lookup of the ip and here is the results:
http://www.ip-adress.com/whois/78.98.76.151

It says there that their abuse-email address is: [email protected]
So if the hacking attempts continue just send them an email with the ip and times when this happened and the hacker might get in trouble with their isp.