I think I've found it. It's a group of "searchprotocalhost.exe" "searchhere.exe" "searchthere.exe" "indexhereandthere.exe"
I then disabled windows search services, along with "windows media crap share service", which depends on the former service.
I've just upgraded my OS from Windows 7 to Windows 8. Everything runs smooth, after I have updated most drivers. My fps in games even increases a little (about 10) in general.
I don't hate metro so I haven't done much tweak to the system.
However when I play counter strike : GO, I have ping...