The operation can’t be completed because you don’t have permission to access some of the items.

when ever i turn on my mac this (The operation can’t be completed because you don’t have permission to access some of the items.) message show up

also

• when i go on google image and try to drag image to dasktop
• when i try to burn audio CD

this (The operation can’t be completed because you don’t have permission to access some of the items.) messasge show up almost when ever i try to do any thing.😕😟

Please someone help me PLEASE