'Username' ..?

  Morz 18:49 24 May 03

On selecting a web address, sometimes I get a 'warning' that it contains a 'username' & if I still want to access it.
No matter whether I click 'yes' or 'no' - cancel, page loading stops.

Anybody please advise meaning/significance of this,
What risk would I be at in accessing such a site,
What programme is 'protecting' me and
how do I disable it?

I have checked - and lowered some, Internet Options Security/Privacy settings to no avail.

I have XP, Opera & Naviscope.

  Morz 20:43 24 May 03

have also got SpywareBlaster, AVG & AdAware6.

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