Lightroom 4.4 loading

Hi, I'm having an access problem to lightroom 4.4. The message reads " The Lightroom Catalog named..... can not be open because another application has it opened". The problem is I'm not running anything else.
Can anyone help?

Yes. Go look in the folder that contains your catalog, and you'll likely find a file ending in *.lock. If it's there, delete it and Lightroom should then start OK. Take care to delete ONLY the file ending with that .lock extension.

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