confirmation messages

When displaying confirmation or questions to the user, can a double negative message be used?

For example in an installation wizard, is it better to say:

-- Would you like to continue with installation? (yes/no)
-- Would you like to skip the installation? (yes/no)

However note that the above statements do not have a negative statement in them. Can we remove the politeness around the statements and say..

-- Continue with installation? (yes/no)
-- Skip the installation? (yes/no)

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