IE 7 home page set to "res://C:\WINNT\system32\shdoclc.dll/dnserror.htm"

[Baffled]

One of my users called me over to fix her PC. When she fired up Internet Explorer 7 (IE7) she got the URL

res://C:\WINNT\system32\shdoclc.dll/dnserror.htm

coming up at the top and the corresponding screen from IE7 saying that it could not find the page.

After running a registry fix (just in case) the problem was still there.

Her IE7 was having no difficulty finding any web pages. So, I just changed her home page to google and all was well from then on.

Something is worrying me about this as I cannot imagine why the home page would have changed to that in the first place. I tried looking up the URL on google but got so many differing possible reasons for this that my head is spinning from trying to think about it.

What I would like to know is this. Am I facing something serious such as a virus or spyware, or is this something else. Also, is it likely to occur again?

Can anyone explain this one please?

[kpac]

To fix the problem, please read: http://www.computerhope.com/forum/index.php/topic,46313.0.html
And post the three logs.

[CBMatt]

It could just be a problem with the page that was being used.  But a HijackThis log could certainly give us some insight.