It looks as if we finally have an answer to the mystery:   unseccapp.exe is connected with Avast's Browser Cleanup Tool (BCT)   [URL]#msg1097333 [URL]#msg1098930 And this is fully consistent with what I noted in the thread about Avast's recent "Emergency Updates", that I noticed the BCT was updated on (or about) 27 May  [URL]  
About  3 or 4 days ago unsecapp.exe and wmiapsrv.exe Wmiprvse.exe  are showing up in my task manager when booting. C:\WINDOWS\system32\wbem\unsecapp.exe C:\WINDOWS\system32\wbem\wmiapsrv.exe Wmiprvse.exe There are a few questions around the web about it but it seems no one knows why. I know they are from Microsoft for incompatability and Service red respectively, but no idea why they are showing now. I uninstalled a few programs I updated the past week but they still show. CCleaner, Sandboxie, Flash, FF. 
Any body else ?