The ''DisplayLinkUI'' icon is no longer detected in the Windows Vista system tray.
 

Recently I reformatted my PC hard disk drive and reinstalled Windows Vista. After I have reinstalled the IOGEAR GUC2020DW6 software, I have received this message on my desktop: ''DisplayLink Display Adapter (8060); Device driver software installed successfully; Ready to use.'' — But the ''DisplayLinkUI'' icon is not detected in the Windows Vista system tray, consequently I cannot use a second monitor.

Remarks: The IOGEAR GUC2020DW6 worked perfectly and the ''DisplayLinkUI'' icon was always detected in the Windows Vista system tray BEFORE I reformatted my PC hard disk drive and reinstalled Windows Vista, that shows there are no defective components.

What can I do to solve this problem ?