After you use the System Preparation (Sysprep.exe) tool to deploy a Windows XP
image, a Windows Vista image, or a Windows 7 image to a client computer, the Basic Input/Output System (BIOS) Real Time
Clock (RTC) on the client computer is set back one hour.
This issue occurs if either of the following conditions is true:
- The BIOS cannot interpret the time
zone to which the RTC is set. The RTC keeps on ticking even when the
computer is turned off. When the computer is turned on again, the computer displays the right time.
When the System Preparation image comes up, the operating system reads the clock. The operating system then applies the time zone that the operating system was last configured to use. The operating system assumes
that the RTC represents the last time that the operating system adjusted the clock. If the
following conditions are true, the computer adjusts the clock when the computer starts:
The Windows image that is described in the "Symptoms" section was
created when the BIOS was set for DST and the daylight-saving time option was
enabled. When the image starts for the first time in SDT, the DST/SDT boundary
code adjusts the clock and resets the current BIOS value.
- The computer was off before the daylight-saving time (DST)/standard daylight time
(SDT) boundary was reached.
- The computer is now on the other side of the
- You are using a dual-boot computer. The
first operating system adjusts the clock when the operating system starts. When the second operating system starts, the second operating system may
adjust the clock again. The second operating system adjusts the clock again because the second operating system does not know that the other operating system has already
adjusted the clock.
To resolve this issue, use one of the following methods:
- Create a new
System Preparation image. For more information about how to create a new
System Preparation image, visit the following Microsoft Web site:
- Make sure that all the computer operating systems are using the correct time.
Article ID: 899855 - Last Review: July 2, 2007 - Revision: 3.3
- Microsoft Windows XP Home Edition
- Microsoft Windows XP Professional
- Windows Vista Business
- Windows Vista Enterprise
- Windows Vista Home Basic
- Windows Vista Home Premium
- Windows Vista Ultimate
- Windows 7 Enterprise
- Windows 7 Home Basic
- Windows 7 Home Premium
- Windows 7 Professional
- Windows 7 Starter
- Windows 7 Ultimate
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