To help you, we need much more information. Please tell us exactly the steps you are attempting and exactly the results you see of each step, including the exact and complete content of any error messages you receive. From your post, there are simply too many different possible reasons, each with separate resolution paths. Your specifics will help narrow down those possibilities and hopefully provide a path to lead you to a solution.
Thanks and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
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