User Guide
351
www.nec-computers.com
Recovery Process
If the System Update is executed before the application of the "Hotfix for Windows
x64 (KB921411)", "!" may be displayed on the USB root hub.
If "!" is displayed on the USB root hub, follow the process below:
1. Start the Windows Explorer, and click the [Tools] and [Folder Options].
2. Select the [Files and Folders] - [Hidden files and folders] - [Show hidden files
and folders] radio button from Advanced settings in the [View] tab.
3. Check the following check box in the [Files and Folders] from Advanced
settings in the [View] tab, and then click [OK].
■ Hide extensions for know file type
■ Hide protected operating system files [Recommended]
When the message "You have chosen to display protected operating system
files..." is displayed, click [Yes].
4. Make sure of the files.
Open "<System drive:>\WINDOWS\system32\drivers" directory, and make
sure usbhub.sys and usbport.sys exist in the directory.
If you can not find them, copy the files according to the following process.
a. Open the "<System drive:>\WINDOWS\system32\dllcache" directory.
b. Copy usbhub.sys and usbport.sys from the directory noted above to
"<Systemdrive:>\WINDOWS\system32\drivers".
5. Restart the system.
6. Refer to “Applying the Hotfix (KB921411)” on page 348 and apply the "Hotfix
for Windows x64 (KB921411)".
7. Refer to “Updating the System"” on page 349 and execute the system update.
8. Restart the system.
The process is finished.
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