IMac won't start in mac. Will only start in Windows, option key won't work to allow me to get to mac side. downloaded avast last week. Worried this could be the problem??

iMac was making a strange sound yesterday. I shutdown and restarted now it will only boot in windows vista.  I've tried option key that doesn't work, I've tried command R no luck.  I've left un-plugged, not sure what to do. I don't even get the white screen like it's trying to load, it goes directly to windows vista, once in windows I can't get anywhere to try and go back.  I did download avast the other week, it seemed to be running fine until yesterday. UGH

If you are running OS X "Lion" or later, boot OS X Recovery by holding ⌘ and r (two fingers) while you start your Mac. For Snow Leopard, start your Mac while holding the c key with its original OS X Install DVD inserted in its optical drive.
At the Mac OS X Utilities screen, select Disk Utility. Select your startup volume (usually named "Macintosh HD") and click the Repair Disk button. Describe any errors it reports in red. If Disk Utility reports "The volume Macintosh HD appears to be OK" in green then you can be reasonably (though not completely) assured your hard disk is in good working order.
If you manage to boot OS X, uninstall Avast. Its effect on a Mac has progressed from complete and utter worthlessness to maliciousness.
Be sure to use its latest uninstaller, which will remove it completely.

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