What?!?!? what is the meaning of the joke? There is absolutely nothing to be worried about and there's nothing to fix. I never got any mail from Timothy about this, else, I would have replied the same thing I'm going to reply now. Here is what they seem to be talking about:
Let's say your contact's name is a link to a file on the internet.
Now let's say that for some extraordinary dumb reason you decide to try to excuse the "/run (!N)" command.
Now that you've done that, let's say that you accept the security warning displayed by Internet Explorer.
... damn, you just downloaded a file from the internet that could be dangerous
.
This "security alert" posted on mess.be should be simply deleted. If you use the /run command, you're aware that you're executing something I think and, if for some reason, you're using it with some tags, I would tend to think that you know what you're doing, don't you think?