I have a cluster of vms on a number of cloned servers using libvirt/qemu. Occassionally the windows 7 vms randomly require a login screen, even though I've done everything I can think of and can google to turn off a login screen. I've

• used netplwiz to turn off requiring a password (http://pcsupport.about.com/od/windows7/ht/auto-logon-windows-7.htm)
• manually changed the regsistry using the instructions here: http://superuser.com/a/28654
• changed requiring a password in the power saving settings in the control panel if the screen goes to sleep
• told the screen to never go to sleep (in the control panel)

Even with all of these things, some of the vms *still* randomly require a login. I have no idea what else to try. Any ideas??