Why wont my Macbook Pro Start in OSX anymore, it seems to love windows?

Alright, so I'm running bootcamp and have done so flawlessly for the past year. My Mac asked me recently if I wanted to install updates and restart, I clicked yes and upon returning to my macbook it said an error had occured installing the updates, i thought nothing of it and shut down the computer.
Since Then the computer will only start in windows xp, If i hold down the option key and both partitions show up, I click on the Macintosh HD partition, and instead of seeing the mac logo pop up, a small 'x' flashes and it starts in windows.
Could anyone help me? this is quite frustrating.

Furious400:
Try Repair Disk
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger) and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel, and report if it says anything but Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
If DU reports errors it cannot repair you will need to use a utility like Tech Tool Pro or Disk Warrior
Do you have a backup of your OS X partition?
cornelius

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