WS.Reputation.1 from different websites

NIS 2013 keeps giving me these malware alerts for various files that Symantec's WS.Reputation.1 system is detecting when they (d/l files) are somehow getting downloaded to my computer.

 

I am not clicking on any of the originating urls, etc, or doing anything else that would be downloading files -- they just spontaneously get downloaded. Has been going-on now for two days. About 8 or 10 warnings on these.

 

Anything I can do to stop these from happening. Tks for the help.