Follow the instructions at http://support.microsoft.com/default.aspx?scid=kb;en-us;324767 to acquire/repair autoexec.nt. Note that instead of expanding the file from the OS installation CD, you can also copy it from the %windir%\repairdirectory.
This error should not occur with newer versions of WinDriver (later than v6.2.3). If you encounter this problem with such newer versions, notify Jungo Connectivity’s support. .