List the attached volumes to Windows instance
nova volume-attachments < Windows-instance-ID >
The OS disk should be attached as /dev/vda
Since it is not recommended to do any operation on the original volume we clone it to a new volume and do all our work on the cloned volume
openstack volume create --source < vda volume ID > < new-volume-name >
List all ISO images
openstack image list --long|grep iso
List all flavors
openstack flavor list
List all networks
openstack network list
Boot Windows from ISO
nova boot --flavor < Flavor name > --nic net-id=< network-ID > --block-device source=image,id=< ISO-Image-ID >,dest=volume,bus=ide,size=7,type=cdrom,bootindex=0,shutdown=remove --block-device source=volume,id=< Cloned-Volume-ID >,dest=volume,bus=ide,bootindex=1 < VM name >
Once you finish you can delete the created instance in the previous step and use cloud dashboard to launch a new instance from the cloned volume which has the fix applied.