Okay, all is good.
First, you don't need to go to that site if you are running the version of mc2xml that comes with MC. I only mentioned that in case you were using the external version. You are using the internal version.
Go back into your History where you found the note that says file mc2xml.exe (executed automatically by JRiver) contains "WS.Reputation.1" that is a risk. That "WS.Reputation.1" just means that mc2xml has earned a bad reputation. It doesn't contain any virus, so you can use it. The mc2xml program earned a bad reputation because there are a lot of other sites where you can download it, and many of them are very dodgy. Some of them even package up mc2xml with Adware, Malware, or even virus'. But the version that comes with MC is fine.
So, on the History page with that message, when you highlight the message there should be a link somewhere on the page that says "Restore". Click that link to restore mc2xml to the correct location on the hard disk. Norton may give you a further warning about the file, but just ignore it and continue. The EPG download in MC should then start to work again. If you don't see a Restore link, there may be an Options link. Clicking on that should then give you the option to Restore & Exclude the file from being scanned. Select that.
If you can't find a "Restore" or "Options" link that history page, perhaps because it happened too long ago, just install or reinstall the latest version of MC again, then run the Guide Load process. If Norton pops up a message about mc2xml, allow it. If no message pops up, once the Guide Load process has finished, or failed, go back into Norton and find the new message in the History, and restore mc2xml.
See how that goes.