General tips and tricks for when Windows is throwing a tantrum.
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CORRECT an UNRECOGNIZED COMMAND
For example if (ipconfig) is no longer recognized, check that the default "long" command (windows\system32\ipconfig /all) still works.
To fix this right click "My Computer" & select "Properties." > Click "Advanced" tab. >Click "Environment Variables" button. Then in the "System variables" box, scroll down to "PATH" and highlight it. Click the "Edit" button and in the "Variable value:" box, add this string to the very beginning of the text "C:\WINDOWS\system32;" without my quotation marks. Make sure you include the semicolon. Then click OK three times.
That should of have done it to test open cmd, right-click and select "run as administrator", Type cd C:\ hit enter, Type ipconfig, hit enter.