Please check Dot Net Platform is installed in your system. Run the utility available in the bin directory, DotNetUtilities.exe, It will tell you the Dot Net version. If Dot Net platform is not available in the system, download the platform. Please see the software requirements page for downloading the platform.
The Syslog listening port specified is occupied by some other process. So please stop the process and start the Free Syslog Forwarder Tool.
Refer document section for this.