forbiden access to cd/dvd drive from my computer

I have a very stupid problem, I can't access files on cd or dvd from my computer. When I double click on cd/dvd icon in my computer, nothing happened. If I access cd/dvd drive from Speed Commander, I can see and copy files, but when I try to view or execute them I get the error massage: "Windows cannot access the specified device, path, or file. You may not have the appropriate permission to access the item".

Does anyone know how to fix this?

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