[OFF TOPIC]
Run "start /?" to know why it isn't needed and why you will get that error, and/or search the net to find
more info. And in case you're wondering I had good reasons why I _did_ use "start" in my (un)installers, and it is not because of your error but because of the /wait parameter. But I'm not going to write a whole tutorial on how to use "start" and how to use the command line and batch files... sorry...