|Next to the clock would be the System Tray, not the taskbar. There would have only been a Registry change if you made one.|
Look here in the Registry [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer. Do you see a "NoTrayItemsDisplay" entry? If so, delete it.
"So won’t you give this man his wings
What a shame
To have to beg you to see
We’re not all the same
What a shame" - Shinedown