Microsoft Security Essentials Icon Missing From System Tray

I am using  "Microsoft Security Essentials" for a long time on windows 7 and found it a good software against the different threats/viruses.Few day ago MSE icon is suddenly disappear from system toolbar.
I tried different things to solve this e.g.

• Check task Manager but there is no msseses.exe for MSE
• Try to manually start MSE service
• Uninstalled MSE and install again but no result.
• Check notification area icon setting from toolbar/properties/customize, it is selected for show icon    

After trying above steps problem was still there,i sense that this may be because of some virus because i had disable MSE's updated few week ago. I installed another antivirus and after restart and system scan my problem is solved.