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Are the the Machines Azure-based, by any chance?

open Powershell as admin and run the following command, post back the result Get-PSDrive

that shows the D as a drive, but nothing about where it came from.

ok, thx! What is shown on the properties of the VM shell? Nutanix, VMware, other?

At the VMWare level there is only the WC disk

ok, next try out autoruns from MS system internals: https://learn.microsoft.com/en-us/sysinternals/downloads/autoruns It provides a good / fast way of identifying start-up items. in this case, you've got a subst command running that i'm assuming you don't want, so, that's gotta be coming from a logon script/GPP/app/KIX script/etc

a simlink on D:\.. found anything in your gpresult?

Not sure if this helps, but we found that some of the Machine Sizes in Azure will automatically provision a "D" drive -- 16Gb, I think -- for Temporary Storage... To get rid of it, you have to choose a different Machine size. Sorry if that's totally obvious, just thought I'd mention it.