I am working on a client's computer running Windows Vista. DNS doesn't seem to be working on the computer. I cannot access web pages using website name/URL. I can access pages using IP address both locally and on the internet. Proxy settings are not set in Internet Explorer. DNS server on LAN is functioning properly and other computers have no issues with same IP settings. From a command prompt, I can ping any live IP address successfully, but cannot ping any website by domain name. I've checked the HOSTS file and there are not improper entries there. I've tried resetting Internet Explorer back to defaults. The "Network and Sharing Center" shows that I'm connected locally and to the internet. Network diagnostics indicate a problem with DNS. Again, DNS server is functioning correctly and this problem reproduces itself when connected at different locations using DHCP settings given by local routers/DHCP servers. Malware scans have come up clean.