How to get dried oil paint off my walls?

How to get dried oil paint off my walls? Can I paint over it??? I don't think I can so I am not sure what I can do to get rid of the black oil paint off my white walls. Please Help!!!How to get dried oil paint off my walls?
You will have to do at least one (probably several) coats of Kilz primer over it and then repaint.How to get dried oil paint off my walls?
Dab on nail polish in small sections. Let the solutions remain on the painted areas for a few minutes before rubbing it off with a cloth. Once finished, take a damp cloth and go over the areas again.

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