User`s guide

Real-Time Windows Target Kernel
2-17
To uninstall the kernel, click the MATLAB Start button, and select
Simulink->Real-Time Windows Target->Uninstall real-time kernel.
Alternately, from the DOS prompt of your computer, type
rtwintgt -uninstall
and the kernel will uninstall from your system. Typing
rtwintgt -forceuninstall
forcibly deregisters the kernel from the operating system without deleting any
files. This option should only be used when all other attempts to uninstall the
kernel fail. This command can be used both within MATLAB and at the DOS
prompt.