Are you referring to the RC Meeting application? If so you the first thing to do is try to uninstall, and reinstall the software to make sure you don't have a bad download. After uninstalling it you can re-download it by logging into your account and clicking the link shown below.
When reinstalling the software, be sure to watch prompts that your security software might possibly present, and be sure to allow, or give permission for the software to run.
If this does not resolve your problem please provide more details.