Apologie's coda, we have to assume that everyone who post's know's nothing about computer's, sure you understand.
Probably the easiest thing to do is uninstall all your gadgets, then reintroduce them one by one until you find the issue.
There should be no need to reinstall just for a dodgy gadget.
First try and close the gadget (if that's what it is) by right clicking it. Im fairly sure you won't be able to uninstall it while it's running. (you'll get the "in use by another process" message)
To uninstall gadget:
1. Open Windows Explorer.
2. Press Alt then click Tools>Folder Options
3. Click View>Show Hidden Files, folders and drives.
4. Navigate to C:\Users\<Username>\AppData\Local\Microsoft\Windows Sidebar
5. Delete all folders, they should all be named <something>.gadget
6. You may need to restart (not sure)