Trouble restoring ical from time machine

My iCal has somehow been corrupted.  It shows up to the present month, but when I select the next month (October 2012), the calendar won't change and the name of the month dissapears. Subsequent months also fail to appear.
I thought of attemping to restore an earlier version of my calendar to solve my problem.  After closing iCal (and every other program I had open) I went into Time Machine and selected previous calendar files to be restored by going into Home > Library > Calendars and selecting restore on the entire "Calendar" folder.  After restoring the folder, I opened iCal and it was restored to my earlier calendars and cycled through the months like it normally should.  Within three minutes, though, it reverted to my corrupt calendar(s).
I then deleted the "Calendars" folder from my laptop (Home > Library> Calendars) and once again restored from Time Machine. After restoring the earlier calendars, I unplugged my external hard drive backup before opening iCal.  Again, when I first opened iCal, it worked normally, but within a couple of minutes my corrupt calendar(s) popped up again and iCal once again refused to cycle through future months.
My questions are, am I doing the restore wrong?  Where is iCal restoring the corrupt calendars from after I restored earlier calendars from Time Machine?
Here are my system specs:
MacBook Pro 2.8 Ghz Intel
4 GB Ram
500 GB Hard Drive
iCal version 4.0.4
Thank you in advance for any help!

I just had a hard disk crash, and had to do it.  I couldn't figure it out until I called Apple Support, my support guy put me on hold and then told me about Migration Assistant.  I guess they lose so few full disks, they don't include a full disk restore out of the Time Machine interface.  Give me bonus points for remembering that you had the same question and coming back to answer it.
Glad it worked for you.  So nice to have everything back, just like it was when you lost your disk.  I really like the Time Machine.  When you need it, you need it.

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