Command Prompt autocomplete problem

[poshi]

Hi,
I am facing a weird problem on my command prompt. I have XP Professional OS.
The up/ down arrow keys to get the previously typed commands is not working.
The tab to auto complete the existing file/ directory name does not work, and I have to type the whole command every time I have to compile/run a file.
Does anyone know if there is a setting that I have to change to do this?

Any help would be appreciated.
I tried HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\ options. CompletionChar is 9.

Thanks,
Poshi

[Unit]

are you using command.com or cmd.exe?

There is a big difference between the two..

cmd.exe allows the use of tab completion and command history. command.com does not unless you run a utility like doskey.