Start Network Monitor from a triggered alert

Hi everybody!

A simple question for you gurus:

I would like to set up an alert through perfom.exe to start network monitor
in a Win 2003 EE machine.
I saw in the Net Mon help file that it should be possible to run a command
like:

start netmon /buffersize <> /capturefilter <path> /autostart /autostop etc.

I tried to add this to a customized alert in the "run this command" field
but it says that the command is unknown.

I tryed to run it from cmd and it just disappears leaving no trace of new
files (.cap ones I suppose) in the HDD...

Any hint?

Thanks a lot!
MD