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Couple of questions
What version of Windows are you using?
Also have you tried logging in as administrator and installing Calibre for all users?
What are your user id privileges for "c:\"? (right click on c: in Windows Explorer select Properties and choose the Security tab)
As this is regarding the internal security of your PC, if you prefer PM me and we can post the solution for other users later on without disclosing confidential settings & information....
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