Have I asked those few who are experiencing issues to run sigil with elevated permissions, yet? If not, please do so to just to rule it out. You should be able to right-click on the Sigil shortcut and select run as administrator.
If that doesn't produce any different results ... another thing to try is to install Sigil somewhere other than the default "Program Files". Uninstall sigil first and then when choosing where to install, choose somewhere in "My Documents" or somewhere else. The gist is to install it somewhere your user account has full permissions. I would also suggest changing where Sigil stores its temporary files (via Preferences, General Settings) to somewhere in My Documents as well, just to be sure.
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