Unlocking my Maxtor on my computer. I cannot unlock my Maxtor!!! I have my password but it will

Question

I cannot unlock my Maxtor!!! I have my password but it will not accept it. Problem may have occured when Maxtor was unplugged and turned off for a time. I may have added to the password when it was reinstalled. I can't remember the original! Senior moment I guess!! Can I reprogram it with a new password?