Can anybody tell me what is going on?

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That looks like the auto-complete/suggest window built into windows for far-east languages. If you have the language bar enabled (by the notification area) make sure it’s set to English (EN) (Or whatever is relevant for your locale).
If it’s not there, go to the “Region and Language” applet in the control panel, on the “Keyboards and Languages” tab, click “Change Keyboards”. Remove anything you don’t need from the “Installed Services” section, and set the default input language to English (Or, once again, whatever is relevant for your locale)