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The 'black thing at the side and the bottom' is a normal function of Windows 8. It could perhaps be disabled: one part of it shows function icons you may click on for important functions, the other part is supposed to show the Time.
It sounds as if your computer has Windows 8 on it, but in a somewhat crippled state, perhaps.
What anti-virus suite does your computer have on it, please?
And what Windows version is it (as shown in
System and Security
at the moment, please ?