IMac running on Mac OS 10.5.8 & Windows XP wont boot from Mac OS

I have an iMac running Mac OS 10.5.8 and Windows XP (ServicePack 3) on Boot Camp 2.2. This configuration has worked for me perfectly for the past 2 years up until recently. From nowhere, the system is now refusing to boot to Mac OS but boots into Windows XP without any problem.
I have tried to repair the Boot Camp 2.2 in Windows XP via the repair/update option from the Boot Camp installation but its giving a fail message;
The installer has encountered an unexpected error installingthis package. The error code is 2727.
I have also tried to verify and repair the Macintosh HD partition using the Disk Utility but its giving me the following error message;
On verify disk
Invalid Sibling link
Volume check failed
ERROR: Filesystem verify or repair failed.
I could repartition and start all over again but there are some files and emails I need to retrieve from the Mac partition before I delete and repartition.
Is there any shareware software that I can install on theWindows XP partition and be able to access/retrieve my files in the Mac partition?

you can't repair Mac OS X from Windows.
What you need to do and realize is that Disk Utility is not good enogh or reliable enough and you need 3rd party disk repair utility.
Or just restore Mac HFS from backups.
You may want to install Mac OS on another external hard drive
Recover the files there - probably best to have two partitions.
you should have already created multiple backup sets: clone type and TimeMachine
Disk Warrior is $90 or there is TechTool Pro 6 for almost same
Cloning is easy enough either from Mac OS X DVD Disk Utility Restore or from another hard drive.
Cloning as a Backup Strategy
Carbon Copy Cloner
WinClone VMware HDD Upgrade
MPG - How To Guides - How to clone a volume
SuperDuper

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Can iMac October 2012 boot from Mac OS X 10.6.8 (Snow Leopard)?

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[click on image to enlarge]
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Hello jaqueline & Welcome to Apple discussions
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