I'm running XP Pro via linksys router and cable modem. After upgrading to Pro certain web sites were no longer accessable such as www.grainger.com and www.chase.com. I set all security to low, flushed cookies and internet files, flushed DNS cache, renamed hosts file to hosts.bak, set all secuity protocols on, and privacy is disabled. Other computers on my network can access these sites. Ping and Tracert give the following error "Unable to resolve target system name www.grainger.com". All ideas are welcome.