You can uninstall Flux on Windows using the uninstaller included with your Flux installation.
If the uninstaller is not working correctly, you can manually delete the Flux services by opening the command prompt and issuing the following command for each service:
sc delete <Service Name>
Where "<Service Name>" is the name of the service as displayed in the Services panel (you can access the Services panel by selecting the "Services" option from Windows Control Panel -> Administration Tools). Normally the Flux services are prefixed with the name "Flux", e.g. Flux Engine.
After the Flux services are removed, delete the Flux installation directory to uninstall Flux.