Adobe Photoshop CS 4 Extended

Hello everyone,
I have installed on my computer with Windows Vista Adobe Photoshop CS4 Extended. Until this upgraded version of Adobe Photoshop I didn’t had any problems with this program. I could work on it without any problems, now when I want to open it I got error message. Is there any solution for this problem? I would really like to work in this version of photoshop.
Thank you
Z
Adobe Photoshop CS4 Extended
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