Ever had that when trying to restore a web it I/D? EBay, Pay Pal, your web mail address perhaps. Even PCA wont let you in with your existing user name ,in resetting the machine after a clear out.
So on here I was Jack- already in use it said- 'I know its me I thought- think up another-[ that was Jack O'lantern]]- The an after another fiddle about had to re register again - name already in use - it said - So now I am sparkyjack I really would like to be jack once more though- can FE fix it I wonder?
I can only think that you may be using the wrong password. It is quite easy to change your password and then forget what it is. I always write mine down in a book now and the book gets used quite often.