Uninstall DCS agent and reboot but still display error！An agent uninstallation requires a reboot when I re-install the agent.

We uninstall the SDCS agent via add\remove program.

When I reboot the machine and try to re-install the SDCS agent.

It told us:

error！An agent uninstallation requires a reboot.
please reboot system before running installation.

But I reboot the machine several times.

What registry can I delete in order to re-install the dcs agent?