I have an old notebook, and it's impossble at the moment to heal the O.S, which is seriously deteriorated by use, completely worn out, let's say. It used to be XP home, it's SP2, but several antivirus told me, when trying to install, it is not compatible, for it needs SP 2 or upper! I don't even dare to update Adobe Flash for the same reason. So, I need t know, before I lose my actual Firefox, which are the OS requirementes for the latest version of this product. Thank you.