Hi. I am unable to open Lightroom 3 on my iMac.

I have returned from holiday to find my Lightroom3 will no longer open. As a photographer with a newborn baby shoot arranged this week. It is causing me a lot of stress.
I noticed the icon has changed from the normal LR one on my Doc station. I still have the normal LR icon as a shortcut on my screen, but LR won't open from any of them. I tried The alt key as was suggested in forums. But nothing opens. You can see the new weird icon in the screenshot i took.
On the 9-8-14, I installed a new Time Machine backup external hard drive . I've noticed the last Lightroom Backup was just before i went away on holiday the day after the TimeMachine was set up.
I'd appreciate any help, as i am not at all computer minded and have no idea where to start to rectify the problem.
Thanks

Hi Moo-min,
You can definitely backup your data using the Time Machine, but we do not recommend doing the same for Adobe Applications.
In these scenarios you should uninstall and reinstall the product.
Thanks

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