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How to remove authentication massages in magento website which is hacked by someone

I have a Magento website. Someone add adds on my homepage in header section. When I click on my websites menus then other links are opening there.

How can I remove it and how to secure in future for this happening? You can see my website on top some adds running I wanna remove it.

Plz help me. My admin panel is not opening.

my Website is

http://borsavela.com/