Hi,
Windows 7 is not supported by Microsoft any more, which means that you are using an updated OS. We strongly advise upgrading to Windows 10. This can save many headaches.
Also, what antivirus software are you using? Most probably that's a false positive alert. Is this happening when you start the dr server application? If so, you can scan it with
https://www.virustotal.com/ to find out whether the file is really infected or not.
Lastly, please always report which exact version of Corona Renderer you are using, and what exactly you are doing right before the error appears.