How to run disk utility mac book air

how to run disk utility mac book air it is very slow on boot up

Here's a general article about slow startup: http://support.apple.com/kb/PH10929
It suggests there may be a third party hardware issue.
Otherwise, you can boot from your recovery disk as shown here: http://support.apple.com/kb/PH10603
Your recovery disk was automatically created when Lion was installed.  You'll have it as a separate partition and be able to boot from it as if it were a separate disk.

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    (62586)

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    Please describe the problem, rather than your conclusion as to how it should be solved.

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    Hello Everybody.
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    See: OS X: Changing or resetting an account password
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    Thank you for posting on the HP Forums.
    Have a good day!
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
    Gemini02
    I work on behalf of HP

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