MacBook pro when windows 7 has startup problem and Mac os doesn't work

I installed windows 7 on my MacBook pro and it did work well. But now windows has a startup problem and "startup repair" couldn't solve it, so I can't use both Mac os and windows and my laptop has become completely useless. Any suggestion?

Reboot and hold down command-R at the sound of the chime, that should take you to the Lion recovery partition, if it does go to disk utility and see if you have an OSX partition at all.

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