If the systray is persistant, then please edit the following file using Notepad :
C:\Program Files (x86)\tsplus\UserDesktop\themes\Seamless\Desktop0.ini
To hide the notification area, you need to search for "tray" and change the value to 0 :
[tray]
visible=0
Once done, please make sure that this file is set to "read-only" so it won't be modified during an update.