My Passport ES doesn´t accept my password and blocket by itself

Hello,

a few weeks ago i updated firmware on my My Passport Essential and all the time I used it unblocket on my computer.

Then I was using it one day on other computer and after connecting it back on my computer is was blocket by itself and doesent accept my choosen password. I have many important data on it and want to get back this data.

What can I do?

Tanks for help!!!