Windows NT 4 text setup running in Dolphin, on the partition selection screen. There are two disks shown: a "16 MB Disk on Unknown Adapter" with a single 13MB FAT partition as C:, and an "Unknown Disk" which "Setup is unable to access".
https://haqueers.com/system/media_attachments/files/111/512/645/248/240/528/original/e9755c1e202fc0ec.png