How do I unlock my Computer?

Tech-Archive recommends: Fix windows errors by optimizing your registry

I really need to use me computer in word, but "This modification is not
allowed because the document is locked" keeps on coming up.
I think my sister has done this accidently, so she cannot help me.
Although i am pretty clever, i have been on this pc for hours now, and would
appreciciate small, unconsise answers.
Thanks
.

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