Installation guide

Note
The boot.ini file is no longer used in Windows Vista and newer. As shown in this procedure,
Windows Vista, Windows Server 2008 and Windows 7 use the Bo o t Co n f ig u rat io n Dat a
Ed it o r (bcdedit.exe) application to modify this boot parameter.
Important
This procedure is only recommended if the guest is having time keeping issues, and is not
supported in Windows Server 2008 or Windows Server 2008 SP2 as they do not support the
USEPLATFORMCLOCK parameter demonstrated here and already use the RTC by default.
This procedure is however supported in Windows Server 2008 R2.
1. Open the Windows guest.
2. In the guest, open the Accesso ries menu of the st art menu. Right click on the Co mman d
Pro mp t application, and select Run as Administrator.
3. Confirm any security exception, if prompted.
4. Set the boot manager to use the RTC (platform clock) for the primary clock source. The
system UUID ({default} in the following example) should be changed if your system UUID
is different than the default boot device.
C:\Windows\system32>bcdedit /set {default} USEPLATFORMCLOCK on
The operation completed successfully
Time keeping for Windows Vista, Windows Server 2008 R2 and Windows 7 guests should now be
improved.
Red Hat En t erp rise Lin ux 5 Virt ualizat ion Guid e
212