Illustrator Will Not Open On My Imac G4

I installed my legal version of Adobe CS1 premium on my 20" G5 iMac and Indesign and Illustrator seem fine but Photoshop gives this mesage "Could not complete your request because of missing or invalid personalization information". Hence it will not run. ...

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I run the same apps as you do and i have never been happyer with them. I normaly have 2 or 3 apps open when i work with photoshop and it still runs beautifully. i did run illustrator in classic mode and it worked fine for me. ...