NIS 2003?

Don't know if this is the correct place to ask this but I assume someone
will have had the same problem.

Since installing NIS 2003 prof.ed, I find that I cannot log on to, or
register with certain websites. I have tried changing all the options
suggested on the NAV help desk. The only way I can get in to these sites is
to disable NIS 2003 completely.
When trying to log in to on site I noticed that in the bottom left of the
screen a small message said, javascript void (0).

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Archy