mahamat,
I had a similar problem with installing Adobe Photoshop 7 on to Panther; it would crash on start up and offer to send a bug report to Apple.
The bizarre solution, which apparently works for all Adobe applications, is to adjust the time zone to a different one prior to application install and then revert it afterwards. Can't think why this works, but it did for me and others.
Appreciate you've solved the problem, but I'm posting this for those might find this thread later and it'd be quicker (and easier) to try than a full OS reinstall.
lex
"Time flies like an arrow, but fruit flies like a banana."