What should I do if a box appears in the middle of the computer screen?
It should be some software that is started when the computer is turned on.
Click "Start" - "Run" (or use WIN R directly), then enter "msconfig" and hit Enter. Select the "Startup" page in the System Configuration Utility window.
Similarly, there are many programs that are automatically started when the computer is turned on. You can cancel the small checkmarks in front of them and click OK.
You can also use Computer Manager to clean up startup items. Click "Startup Items" to disable unnecessary startup items.
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