You might try procedures at http://support.microsoft.com/kb/326155/?sd=RMVP
Try "Look for Hosts files" at the middle of the page.
Please post back wether you have fixed the problem. Other's are experiencing this problem as well.
I do internet banking and when I click onto the LOG IN it opens a new window (Like it is supose to) but then it comes up with Page Not Found and DNS Error.
I run Windows XP and Norton Antivirus. Just recently I had to delete a file that contained a virus and since then I can cot access the Log On sites. I have tried the IEFIX and checked the Firewall systems etc and still it won't let me access it? I have NO Problems comming up in Norton.
If any one can help me I would apprishiate it.