Why won't my computer open my catalog?

I am using Lightroom 3 and in the process of the program starting, my computer crashed.  When I restarted the computer and attempted to open Lightroom, I get a message reading "The Lightroom catalog named "Lightroom 3 catalog" cannot be opened because another application already has it opened.  Quit the other copy of Lightroom before trying to launch."
It gives me the option of opening another catalog but the last time I backed up was a month ago.  Is there any way to unlock my main catalog so I can get to it?  I guess this will teach me not to backup frequently!

KelliAnn,
That is the message you get when there is a .lock file present. You must not be trying to open the catalogue you think you are.
If you know the location of the catalogue you want to open, make sure there is no .lock file present in its folder, and then double-click on the catalogue icon. That will bring up Lightroom using that catalogue.
If you don't know the location, search your entire system for files ending in .lrcat.
Hal
p.s. I've heard that you may also need to delete a .journal file from the catalogue's folder.

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