When another person used my computer, my gadgets disappeared and I have not been able to retrieve them with System Restore
Not sure what 'Google gadgets' are, but if they are browser toolbars or other add-ons, go to tools>add ons(Firefox) or Tools>Manage Add Ons(IE) and see if what you want is 'Disabled', if so, just enable again. You have to be a little bit crazy to keep you from going insane.
Restore your computer when no one used your computer. I think it work.
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