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I can't terminate some processes. It says "Access denied". I am the ultimate owner of the computer. How can I terminate such processed anyway?

These are not system processes, these are file managers during file deletion.

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Are you running task manager as Administrator? – HackToHell Jan 19 '13 at 14:27
@HackToHell don't know; how to run TM as admin? – Suzan Cioc Jan 19 '13 at 15:56
@SuzanCioc This answer shows you how to run it as admin. If you have that, click on Show processes from all users and try to end your process again. – nixda Jan 19 '13 at 17:03

Sometimes task manager doesn't kill the process. It's also possible to kill processes from command line with 'taskkill'.

taskkill /im process-name /f
taskkill /pid process-id /f

It might require to start 'cmd.exe' as Administrator. This can be done at least in Windows 7 by clicking Windows-logo, typing 'cmd.exe', right click the icon that appears, select 'Run as Administrator'.

I've seen also processes that this procedure wasn't able to kill. Microsoft documentation of taskkill

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When in task manager, on the bottom left is says: (the shield thing)show processes from all users. Click on that and after, more tasks will appear and then you will be able to delete the task you want!

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You should add some screen shots or more detail to this answer. – JUICED_IT Feb 12 at 22:41

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