Please, do the following:
1. Add the Host installer to your antivirus software exceptions list. Specifically, add two folders to the exceptions: the folder where you downloaded the installer (I also recommend that you re-download the file) and the target folder "C:\Program Files (x86)\Remote Utilities - Host". The latter may not be created yet, just add it manually to your a/v exceptions.
2. Clean up the older installation. Follow this Uninstall Host
3. You may also check the Microsoft Fixit
tool in case you cannot get rid of your previous installation.
Once you complete the steps above, restart your computer and try installing again. Make sure that the Windows account has full administrative privileges because they are required when installing the Host (it runs as a system service after the installation).
Hope that helps.