I have a Linksys BEFW11S4 router, and I configured it for wireless access under Windows 2000. Everything worked fine. I recently installed windowsXP service pack 2, and I wanted to change some settings on the router (mainly to turn the security on). When I typed 192.168.1.1 in the browser, the login screen showed up. After I put in the password (admin), the login screeen flashed and showed up again with the password field cleared. After couple more re-tries, I got a 401 error page. I can still connect wirelessly and access the internet, just can't access the set up page. Please help. Thanks.