Win32.pornpopup

Spybot found this on my computer -  Win32.pornpopup.  After it is removed, it keeps coming back.  I ran norton internet security but the scan does not pick it up?  Anyone else having this problem.  This obviously sneaked passed my norton internet security.  How do we let the norton folks know about this malware?

 

BTW, I don't go  on adult sites.  So I have no idea how I picked this up.

 

Thanks.