Problem with Norton Insight Network handling of threat

I think I have a problem with Norton Insight Network.   

 

On Oct 27, I received a message from Insight saying it had removed a file (mstsc.exe) that had been downloaded onto my Desktop (WS.Reputation.1 ).    This file had been downloaded from a website called fairysm.com.

 

On Oct 28, I noticed there was a new icon on my Desktop named mstsc.exe.  I checked Norton Insight and it said this file looked okay.  I didn’t trust it, so I deleted the file and emptied my recycle bin.  It had been downloaded from a different website (which I didn’t record).

 

On Oct 29, I received another message from Insight telling me it had quarantined a file (mstsc.exe) that had been downloaded onto my Desktop (again, a WS.Reputation.1).  This time the file had been downloaded from a website called karolie.com. 

 

Why is Insight handling this threat differently each time it encounters it?  First time, deleted the file .  Second time, ignored the file.  Third time, quarantined the file.

 

Also, is anyone familiar with this (malware) problem?  I know that there is a real mstsc.exe which is part of Windows, but I have also read that there is malware that masquerades as this file.  The fact that it keeps downloading every day has me extremely concerned.  Anyone know how I can stop this from happening?

 

Thanks,

JoanB