How are you trying to run IPCONFIG and what OS are you using....
This error message means that the user concerned doesn't have read access to some system file required by the application. This sometimes occurs with Visual Basic applications where the appropriate permissions aren't set to allow read access to the Visual Basic runtime DLL. But it can occur if read access is not permitted for any DLL, OCX or other component used by the application. It usually only occurs if the software components have been manually copied to the application folder or Windows System folder instead of being installed using the Setup program provided by the application developer. MEANING TO YOU Is this a valid Windows Disk or a pirated Copy.
If its valid then you could also have an administyrator setting problem.. try this also
Log in to the system using a username that has administrator rights. Open a command prompt, then type the command:
CACLS <full-path-to-file> /E /G BUILTIN\Users:R
where <full-path-to-file> is the full pathname of the runtime file or other component to which the application requires access.
If you don't know the identity of the file that is causing the problem, you could try giving all users read access to all DLL and OCX files in the application folder and the Windows System folder:
CACLS %systemroot%\System32\*.dll /E /G BUILTIN\Users:R
CACLS %systemroot%\System32\*.ocx /E /G BUILTIN\Users:R
There is really no reason why any user should not have read access to any shared system files.
Hope this helps a little... if not ... then one last try....
Creat a different User account with full priveleges and try the IPCONFIG command again.