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...