If Aperture is frequently crashing, and only Aperture, it does not necessarily mean, that Aperture is causing the crashes, it might be, that you have incompatible software installed, that installed problematic kernel extensions, start up items, or plug-ins, are preventing aperture from working correctly. Then you would need to update incompatible items or reinstall the system.
Check, if all your third party software is compatible with your current MacOS X and Aperture. If other software installed kernel extensions, this can cause Aperture to crash or panic.
I.e. check the versions of your NIK plug-ins.
- Other reasons, that may cause Aperture to crash or panic, may be corrupted items in your Aperture library. Does Aperture crash, when you open it on a new, empty Aperture library and import some images for testing?
- Does Aperture work with your current library, if you launch it with the SHIFT-key held down? Report back with your findings.
See this documents, on what to check: Aperture 3: Troubleshooting Basics
But to finally answer your question:
How do I uninstall with out losing the libray config and re install from the discs. Can I just down load the full program and intall with my keys ?
Reinstalling will not affect your Aperture library. But you cannot download an Aperture installer for a version compatible with Lion.
Move Aperture to the trash and use your Aperture 3 install disk to reinstall, then immediately use Software update to update to Aperture 3.4.5 again,without trying to run Aperture before.
The updater for 3.4.5 is here: http://support.apple.com/kb/DL1657
Afterwards you will have to enter all three serial numbers, for the versions 1, 2, and three.