I recently did a full system scan using Windows Anti-Spyware.  One of the things it identified was my Spam Filter software "SpamShield" as potential spyware.  Below is a screen capture of the report Microsoft Anti-Spyware issued:

This is not entirely a 'flaw' but definitely a heads-up that some detections need to be looked at on a case-by-case basis. I had noted something similar in Symantec's Norton Anti-Virus, it was running on a system which also had ISS's BlackICE and that program could do packet captures. 

Problem was the data contained in the capture file was being viewed by Norton as a virus (which it was, but harmless as data in the capture file).  This would cause Norton to quarantine the file, subsequently crashing BlackICE which in turn left the host computer unprotected by the measures provided by BlackICE.

Once the two companies were made aware of the problem, a work-around was introduced and the two co-existed peacefully from that day forward.  So the bottom line here is, be careful what you do with catch-all solutions that may inadvertently  impact you and your machine in a not so nice way!