All that means is it tried to install and ran into something that blocked progress.
The second part does not really apply on an initial install. If you were doing an upgrade, then it says, we put back the pieces we had changed (left as it was)
Common issues:
Admin rights are needed (and you must approve, when UAC asks for permission
Antivirus/firewall blocking. Try suspending the A/V (and be careful what else you do while it is suspended)
You left a previous Calibre install RUNNING, while trying to UPGRADE (this is not your issue?)
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