I am assuming you had to shrink your Windows install to install Mint. If this is the case I hope you defragmented your Windows install before you started.
It is common for Windows to have to be booted a couple times for it to adjust to the idea of not having as much space as it had. That is especially true if you took a significant amount of the free space available to Windows for Linux.
Reboot it a couple of times and hope for the best.
Does anyone know what that was about though?
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