Wireless Laptop w/WPC54G

Hi
When i try to log on to the internet through a BEFW11S4 from my laptop using
a WPC54G PCMCIA card Internet explorer requests a password, although none
has been set anywhere!!! And also I have no problems like this if I check my
email though Outlook. Why is it looking for a password on (I assume) port
80??

Thanks


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Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.543 / Virus Database: 337 - Release Date: 21/11/2003