I upgraded to M lion and now ical won't work

I just downloaded Mountain lion to upgrade from snow leopard and when I tried to open my calendar, a window pops up and says "You can't open the application "calendar" because powerPC applications are no longer supported."
Any advice?

Welcome to the Apple Support Communities
It looks like the upgrade didn't go well because Calendar is damaged. First, I recommend you to reinstall OS X 10.8.2 > http://support.apple.com/kb/DL1581
If it doesn't work, reinstall OS X Mountain Lion. Hold Command and R keys while your Mac is starting and reinstall OS X. As Mountain Lion has to be downloaded again, this may take hours

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