I had a similar problem. There is probably a fault with the Path.
If you go to Start - Run - cmd and type "cd\" at the prompt, you
should get C:\> then type CD windows , and then CD system32.
Then try your ipconfig again.
I fixed mine by going to start - settings - control panel - system -
advanced- envronmental variables - select "path" under "system
variables" and click "edit". In the "variable value box" edit or
change it to read
%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\wbem
Mine had a lot of stuff after "wbem" which I deleted, which I'm not
sure how important it was, but I have not seen any problem so far.
There is some reference to this in this Microsoft article:
http://support.microsoft.com/default...b;en-us;319114