Cant launch Disk Utility from Finder

I've been having a problem opening the disk utility recently. When I try and open it from finder, I get the message 'The application Disk Utility quit unexpectedly". It gives me the option to relaunch, but this doesnt fix the problem. I used disk utility a few days ago and it seemed fine, so not sure whats happened. Can anyone help?
Thanks

Please don't ignore, it happened to me =(

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