First, I'd like to thank you all for your site!  Awesome reads!
The skinny:
Sm company running SBS 2003r2 with all updates
4 nodes running xp sp3
All have typical setups (running the ConnectComputer...etc.) I did the normal setup on the server as well (running the wizards) 
I'm not certified, but probably certifiable.  I'm relatively new to SBS and servers in general. 

Here's my problem:  The network and all computers working great.  Then, last Thursday, one user can log into the domain, but when she WANTS to get to the "companyweb" or other "server" sites, it is requesting she log in.  Once, she does, it's all fine.  But everytime she opens the "companyweb" it will request her to log in.  She can surf the www, but not the company site. 

This had HAPPENED once before and because the user had let his password expire, and I reset password. It WORKED. 

I checked to see if she is allowed to be in the website, she is. 

This time, it's not working and I'm at my wits end. I'd appreciate any suggestions. 

All the best,
BrianDid you already read the basic information?
HTTP://www.microsoft.com/Windowsserver2003/Sbs/Default.mspx

Recently Microsoft has went a number of security updates.
User Log-In is one of the issues.Thanks for the quick response Geek.

Yes, I've read that and I don't know how many kb's.  Still, to no avail. 

I'm searching for the recent updates for that user issue.  I thought the nodes were all updated. 

Any other ideas?I've discovered that the user can log into any other machine and be able to access the "companyweb" with her user id; however, at her computer it's not the case. 

I did discover that she had admin rights and since had cut that off.  I've checked her passwords in the control panel | Users Accounts |Manage Passwords and there are no passwords in there that are saved.   

I'm at a loss and do appreciate any wisdom on this matter.
The only thing I would try is to  trun on the built-in administrator account, log into that account and see if the problem is present on that account. Or maybe try to create a new account with the same level and try it. Bear in mind that to propagate a new account in the system be a hassles. but with my limited experience with Windows, that is what I would try.
May be you should try some other forums. But too many of them are after you money. I would suggest www.annoyances.og and go into the 2003 forum and PUT a questoin there.
Thanks Geek-9
I will try what you said with both instances.  I really am liking the quizzes here!  awesome to see people help each other!
Thanks again