Are you having problems running Illustrator CS4 on a Win7 64-bits. Many users are reporting that when they try to open Illustrator it immediately shuts down after passing the plugin checks and loading the Welcome Box.
This can be caused by several things. Try typing “Event Viewer” in the search box on Win7 Start Menu. Then go to the Windows log > applications tab. Look for errors marked in red in the left hand column.
Quite often the problem is related to hacked versions of Illustrator. Obviously we are unable to help you with this. However, if you have a genuine Illustrator and experience this problem, post the Event ID and Source number from the above log as a comment and we will try to assist.