I think you're here because you can't solve windows taskbar problem on your own, there are two kinds of solutions.
1. Navigate to the Windows start menu by clicking on the Windows logo (Start) button.
2. When the Start Menu opens, select "Control Panel".
Some plugins may be not good to use or malicious, then you may want to remove them, it is not hard job to do, follow below tutorial to remove unwanted plugin now, this instruction is based on Firefox browser, other browsers may have a little difference.
1.Open Firefox browser, click on
and choose add-ons, a new window will appear.
2.Find the plugin or add-on you want to remove, click on Remove button on the right.