Re: Error 31: A device attached to the system is not functioning, Windows 7 host, v. 7.1.4

1. Shut down Workstation.
   
   
2. Open the registry (Start > Run > regedit).
   
   
3. Browse to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\hcmon\.
   
   
4. Create a new key called Parameters.
   
   
5. In Parameters, create a new DWORD value entry named DisableDriverCheck, and then set the value to 1.

     6. Reboot

Appears this issue is for Windows 7 host. The fix worked on the few I tried.