You don't mention which DE you use.
in plasma:
right click the Mageia cauldron (application launcher menu)
choose "Edit panel"
hover the mouse pointer over the system tray. a popup menu should appear title "system tray"
choose "settings" option
a new window will appear "System Tray Settings"
Choose "Entries"
Change "HP-systray" to "always hidden"
"apply" and it should vanish - I dont know if its forever though
I dont care about it, I just ignore it.