Why is iCal not opening? Is it the fault of Lion?

Hi, I wonder if anybody out there can help med? On my MacBook iCal won't open at all. I'm not very sure when the problem started, possibly when I installed some more memory and Lion. I'm now on OSX 10.7.4. Does that mean that my old iCal should be deleted and a new one downloaded – where from?
Thank you in advance for your kind advice!
Josabet

Josabet,
Try removing the com.apple.iCal.plist file from your Macintosh HD/Users/yourusername/Library/Preferences Folder. To find Library folder, use Finder>Go Menu>Depress the "Option" key>Library. Drag the .plist file to your desktop.
Also, when you are in the Library Folder, open the Calendars Folder and remove any files with "Cache" as a part of the file name. Log out/in, or restart and check iCal for functionality.

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