[SOLVED] Windows Server 2025 not working with Virtio Disk

Out of curiosity, what made you try the drivers in X:\amd64\2k25? I'm just wondering because most guides (also non-Proxmox ones) seem to use the path recommended by the page you linked to. I quickly looked at both paths and they seem to both include the very same driver, so unless I'm overlooking something, this should not make any difference.
 
Using the path "x:\vioscso\2k25\amd64" results in my case in an empty field of drivers. Using "x:\amd64\2k25\" results in an entry of driver(s) to choose. There should be no difference, but in my case there was this difference. I don't know why, and it was the first time for me. Last install of WS2022 works flawlessly without the folder-confusion...

best regards
 
Are you sure you chose "SCSI" as Bus/Device and not "VirtIO Block" for the hard disk?
The difference between those two directories is, in "x:\amd64\2k25\" you can find the VirtIO Block driver too.