We have this question quite often recently and to say the truth this was a big mistake done by Microsoft, allowing people to use Administrators rights as normal user accounts.
These days most of the people may suffer from receiving permission issues like this and can't properly deal with that because they never heard about file and folder permissions.
Now what you do is reading this and change the file and folder permissions to suit your needs as user:

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I'm having a big issue with permissions on Windows 10/8.1 ... I wanted to import data, but it fails with:
2015.11.28 23:27:42.191 HistoryCenter: create folder 'history\downloads\USDJPY' failed, check permissions
I'm frustrated with this issue. I can not install MetaTrader without issues. How did you do that?