Hi,
Both of these commands are protected from accidental deletion by Windows, i.e. if they get deleted Windows will just add them back to the folder C:\Windows\System32.
In the command prompt, try changing to this folder by typing cd C:\Windows\System32 (and then hit return) before trying ipconfig or ping.
If this gets you executing them then your 'path' is probably messed up.
You may wish to set a system restore point first...
http://support.microsoft.com/kb/948247
...in case you mess things up and need to restore to it...
http://support.microsoft.com/kb/306084
...then...
- Hold down the Windows key (between Ctrl and Alt) and hit the Pause Break key
- Click the Advanced tab
- Click the Environment Variables button
- In the System variables section click Path (you may have to scroll)
- Click the Edit button
Paths are separated by semicolon (;), is there a path to %SystemRoot%\system32? If not, add one (make sure to separate with semicolon). Click OK (three times) to get out. Reboot the PC and try again without the cd command above.
Tricky