Dreamweaver installed but blank popup - what can I do?

I've installed Dreamweaver CS3 on a MacBook Pro. This works on another machine (of the same spec) but on my one when Dreamweaver launched it comes up with a blank popup - see image. The only option is to click 'ok' which then closes the programme. What can I do to get it working?

It Looks like it would prompt you for registration of the Application,
Could you test with a New User Account (Can be simple as a Permission problem)
If the new (Admin) User Account doesn't work check the disk Utility to repair permissions:
- About Disk Utility's Repair Disk Permissions feature
I think the problem might also be linked to:
The function `CGSFlushWindow' is obsolete and will be removed in an upcoming update
  Unfortunately, this application, or a library it uses, is using this obsolete function,
and is thereby contributing to an overall degradation of system performance
- Simular Forum Post for Cs5.5:
Re: Dreamweaver 5.5 crashes with Mountain Lion
Hope this helps

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