With that little bit of information it is hard for anyone to help you.
We need to know what system you are using, etc? Does the program try to load? If so, it could be a corrupt font. Have you tried resetting your preferences (information on how to do this is on the forum FAQ)?
Forgive me for not goving details- it is the first time writting on a forum
As I said, yesterday it was working.
Yes the program try to loads, and tries to initialize and upload etc but it stops giving the message:
Adobe Illustrator CS3 has stopped working
A problem caused the program to stop working correctly.
Windows will close the program and notify you if a solution is available.
No I haven't try to resset my preferences.
I would likely suspect that a corrupt font is the issue as that's usually the culprit when this happens. If you have changed or added any new fonts recently go back and uninstall those and see if it fixes the problem. Someone with Windows will have to step in and give you the procedure for cleaning out font caches.
If that doesn't work, then try resetting the preferences.