Problem using special characters on Firefox 1.5 RC2 (Such as ñ)

When firefox was first installed I could just hit alt-n, n and the =C3=B1=
=20
would appear (I need it for my last name :P), but every time I install=20
firefox it just stops working altogether.  I am unable to use character=20
that has somethin gadded to it.  It just won't ocme out.  Such as=20
accents (alt-e, and the tilde for the =C3=B1).  Other symbols such as =C3=
=B8 and=20
=CE=A9 work fine since I'm not adding any thing to an existing characters=
,=20
but accents and =C3=B1 won't work.

Any ideas?  Thanks.