Once you find out what the eight sided icon is, as Lurkswithin suggested, use Autoruns to stop the process.
To do this open
Autoruns go to the
Logon tab and scroll down to the process you want to kill. Then untick the box alongside it's name.
AutoRuns for Windows
Edit: Please reply back with the name of the eight sided icon programmes name, and we can help you further if it's malware...