1. Download the virtio-serial driver ISO from here
2. Attach the ISO to your Windows VM
3. Navigate to Device Manager and find PCI Simple Communications Controller
4. Right click, then select Update Driver and select the mounted ISO in C:\visoserial\<OS-Version>\
5. Once that is complete, navigate to the mounted ISO in File Explore.
6. In the guest-agent folder, select and execute the installer that matches your system
Verify that the Agent service is running in the Services application or in PowerShell with the following command
Get-Service QEMU-GAFrom the PVE host CLI, use the following command to verify the host can talk to the guest agent
qm agent <vmid> ping