I understand you are unable to shutdown your computer and will try to provide options to resolve this issue without the need to reboot. Here are a few suggestions: 

1.) Since you mentioned "the window has become larger than everything else" this may be caused by the full screen mode option in your browser. Press "F11" key on your keyboard to disable this mode. If this does not solve your issue you can press F11 again to disable this mode.

2.) If this does not work you can attempt manually end the browser process via task manager. Try pressing the "Ctrl + Alt + Delete" keys on your keyboard. This should bring up the Task Manager. If you can see the Task Manager, try ending any non-essential processes such as Chrome, Firefox or Edge to free up resources. 

3.) Another options is to wait until the files on the USB stick have finished transferring over to your computer. If you are unable to determine the progress of the file transfer it would be best to wait overnight to allow the transfer to complete before attempting to rebooting your computer. If you are still unsure if the transfer is complete after this, you may need to seek additional assistance from a relative or technician.

I hope these steps help you resolve the issue and get back to using your computer normally. Let me know if there's anything else I can assist you with.
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