Account disabled due to “unusual activity”

Dear all, I have a problem with my msn messenger. It wont let me sign in saying that it has been temporarily disables because of unusual activity. It then gives me the option to sign in by entering some information about my account, it wants me to ask a series of questions but the problem is that I cant remember the answers to most of the questions. I dont know what to do? How I can i get my account back?