My computer shut down directly after an update of i tunes

I updated i tunes and directly after i heard the tone that shows that the download is finished my computer shut down. And now I cannot start it again. What should I do?

# Download the full Firefox installer from http://www.mozilla.com/
# Delete the Firefox [http://kb.mozillazine.org/Installation_directory installation directory], making sure all the Firefox files and folders are removed. The default location on 32 bit Windows is C:\Program Files\Mozilla Firefox\
# Re-install Firefox
Note that deleting the Firefox installation directory will not remove your bookmarks or other Firefox user data, they are stored elsewhere.

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