Many people are using free application  called MagicTray which lets you hide all the icons in single click in the system tray but if you don’t  want to use that application then here is one simple tricks to hide all or some of System Icons In Windows 7 System Tray

• Right click the arrow on the system tray and select Properties

• A new window will open called System Icons and turn off the system icons you don’t want to see in windows 7 system tray

• click OK
• it’s Done