Continual username & password prompts in Explorer

Hi,

This is a problem that I've been looking at for quite awhile without finding a solution, any help would be greatly appreciated.

When using a web browser (either Internet Explorer or Mozilla), I continually get username & password prompts on EVERY page when it loads. Doesn't matter if it's majorgeeks.com or yahoo or whatever - I get one to many username & password prompts for each & every page when it loads.

I have taken my laptop out of my local network & will get the same results from a hotel room or friend's network, so it is not specific to my network.

I have run virus scan & spyware scans mutiple times without finding anything.

And the kicker is that when I am on one customer's network, the problem disappears. However, the only setting that I can see that is pertinent to their network was the domain setting - I removed my laptop from their domain in the network ID of the computer but that didn't help.

So I am befuddled at this point & was hoping somebody might have seen this or have a clue.

thanks

Shel