I use ubuntu along with windows 7 in my laptop and few days back the panel in linux which shows the date,network,messages and so on disappeared and without it i couldnt connect to my datacard.

So for all others having this problem here is a fix.Type these in the terminal
You can refresh the panel with
Code:

killall gnome-panel &

If you want to return the panel to the default settings:
Code:

gconftool-2 --recursive-unset /apps/panel && killall gnome-panel &

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