Personal Folders Network Connection Password

[tradmusic]

Hi,

Sometimes, when I receive an attachment, or sometimes just randomly when I
open a particular e-mail, I get a box opening called Personal Folders
Network Connection Password.

It asks me to enter my network password - which I am of course reluctanct to
do. What's happening here?

I'm not trying to save anything onto network, I'm simply opening an e-mail -
so why the prompt?

I'm worried that it's a virus of some kind, however I am anti-virused up to
the hilt here! (Kaspersky, Firewalls, Sygate, Adaware, PestPatrol - jeesh,
tell me they're not still getting past all this!!).

Any advice would be appreciated. Thanks.
Nath.