menu keyboard shortcuts not functioning in photoshop cs version- help me

From: Anil Kumar
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using photoshop cs version, 6 and 7.x also exists on my system, shortcuts are well in 6 and 7.x, and tool box shortcuts are working well in cs version, but menu shortcuts such as ctrl-D, ctrl-N, del key etc are not working, mine was activated version only, I gone for adobe site, but I did,nt find related one, PLEASE HELP ME, I DESIRE TO USE CS VERSION