Thank you for your post.
A question that comes immediately to mind is, "What has changed since last Friday?"
As FileMaker Pro 7 launches, the splash screen informs you what is loading at the time. For example, if it freezes on "Fonts", then there could be a corrupted font. If it freezes on "Initializiing...", there could be several reasons.
It is possible that FileMaker Pro 7 has become corrupt, or one of the files that FileMaker Pro 7 uses to launch has become corrupt. Try uninstalling and reinstalling FileMaker Pro 7.
Please keep me posted with any update.