Had the same problem on only one of my WinXP boxes... This really makes no sense to me as the command intepreter (command.com) IFOedit is looking for is a Win9x hold-over from its DOS roots and does not exist in a windows NT environment. (Weird... Works fine on one of my WinXP boxes but not on the other. And also works properly on my Win2k box which also does not use command.com) Anyhow, here's what I did and it's a relatively easy and quick fix: Copy cmd.exe (located in WINDOWS\SYSTEM32) to the root level of your WINDOWS folder and rename it to COMMAND.COM