Use Add/Remove Programs to uninstall Reflection for the Web.
If MSS is on the same machine, you have the option to uninstall it as well.
On Linux or UNIX systems:
Run the uninstaller found in the Reflection for the Web installation directory.
If MSS is on the same machine, the Reflection for the Web uninstaller is found in this directory: mss/server/web/webapps/rweb-client.
You also have the option to uninstall MSS.