password not being accepted

Hi.
I have used winscp for almost a year and I absolutely love it.
It is not accepting my password. I has not been changed, nothing has.
I'm not all that computer literate so I have no idea how to trouble shoot or fix this problem.
Any help will be greatly appreciated!

Something mush have changed if it stopped working suddenly.
Can you login with any other client using the same protocol?
Did you try to contact your server administrator?