I am no expert on DOS commands, but it appears your path does not contain the basic System32 entry. Perhaps it is because of the problem, but can you run the commands using an Administrative command prompt or changing to the Windows\System32 directory to run the commands from there?
You might check your Environmental Variables on the advanced tab of the System Properties (sysdm.cpl) to see if the path actually contains Windows\System32 entry, without the additional backslash you show.