16 bit ms-dos subsystem message

> hello all,
>
> i just a new laptop with vista home premium installed. i am trying to use
> this laptop to communicate with industrial equipment. i get the following
> message
>
> administrator: command prompt-procomm driver does not support the selected
> baud rate (300) choose close to terminate the application.
>
> procomm is the communication program i am using in the ms dos mode ( command
> prompt). does this mean vista can not communicate at 300 baud or is the usb
> to serial adapter not working? i am using a usb 2.0 to rs 232 adapter to
> create a serial port on the laptop. i installed the software correctly.
>
> any ideas?
>
> thanks pat