I am running Windows XP Home edition. Lately, I am facing a peculiar problem. Whenever I launch the MS DOS command prompt and execute commands like PING or IPCONFIG, I get an error message saying 'ping' is not recognized as an internal or external command, operable program or batch file. However, when I run the same PING or IPCONFIG command from the open dialog box of the Run option on the start menu, the command executes properly. Any clues??