As D drive is temporary storage so new files on D drive will be lost. The screensaver, wall paper, new files on C drive are available after Redeploy.
Reference:
https://docs.microsoft.com/en-us/azure/virtual-machines/troubleshooting/redeploy-to-new-node-windows

Reference:
https://docs.microsoft.com/en-us/azure/virtual-machines/troubleshooting/troubleshoot-rdp-connection

Reference:
https://docs.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-password-hash-synchronization

A virtual network is required when you create a NIC. Select the virtual network for the network interface. You can only assign a network interface to a virtual network that exists in the same subscription and location as the network interface. Once a network interface is created, you cannot change the virtual network it is assigned to. The virtual machine you add the network interface to must also exist in the same location and subscription as the network interface.
Reference:
https://docs.microsoft.com/en-us/azure/virtual-network/virtual-network-network-interface

Reference:
https://docs.microsoft.com/en-us/azure/virtual-network/security-overview