To troubleshoot toolbar error 2738 issues, Follow the steps given below.
How to enable certain notification icon on taskbar:
1. Right click on the Taskbar, select Properties, Taskbar Properties window will be shown.
2. Click Customize to open the setting window.
3. Find and choose the notifications and icons which you wish to add the taskbar, click OK, the setting is completed.
1.Open Chrome and type chrome: //plugins in the search box.
2.Then you can see the state of plugins which you've forbidden are Enable.
3.Click the Enable to restore it, when the state turns to Disable showing the plugin has been restored.