Hi there,
I understand you now. Technically the answer is yes, but the practice is a bit harder...
When you did the first Archive and Install there would have been a System Folder called 'Previous System' on your Hard drive...technically you could swap them over yourself...but it could get very messy, and you could end up doing a full install if it goes wrong. (Backup first)
10.3.9 is/was very stable. Can you send me the System log...we can then have a look to see if we can see what is causing the crashes...
I personally, would back everything up. Then do an erase and install from 10.3.0 then download the combo updater mentioned earlier...then start readding your Apps.
The chances are that it is a third party piece of software that is not playing nice...
regards
Ric