Re: My CS4 keeps shutting down when I try to use it,why?

I don’t know why this happens and with the information you have provided I doubt anyone can do so so with accuracy.

Please read these (they concern general trouble-shooting and how to pose questions on these fora):

http://blogs.adobe.com/crawlspace/2012/07/photoshop-basic-troubleshooting-steps-to-fix-mos t-issues.html

http://forums.adobe.com/docs/DOC-2325