Password not valid…..reset????…………………only for the 15th time this month???

Hi, I am not sure if anyone can help with this issue I am having with only one of my outlook accounts and that is to do with my password not being recognised. I recently had an issue with some idiot sending spam from my account, it had not been hacked as such just someone piggy backing my account and sending **** to people in my address book. Ever since it has been quiet and my account has not been spammed. However what I am having issues with is every time I go to log in Outlook wants me to reset my password saying it was either incorrect or it had been entered incorrectly too many times and I was locked out. Now I check my account daily and this will happen several times a day, I only checked my mail last night and it was fine. A friend of mine who had been spammed by the idiot from my account is also experiencing this blip with signing in...............can anyone help as I am fast running out of different passwords to use............HELP!!!!!! Mandy