It wants to change all the drivers for your system. The pci serial controller is very likely your internal modem.
Take this out and boot into windows and let it sort out everything else first. Then install your modem and have the drivers ready.
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How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.