Nope, that didn't work.. that tweak was just for that security center warning, not that other tray icon. Ok, now the only key which could be responsible for this is one of these: Disable ALL BalloonTips [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced] "EnableBalloonTips"=dword:00000000 [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced] [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] "NoSMBalloonTip"=dword:00000000 Try to change the values for this keys to dword:00000001, maybe this will fix the problem...