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I currently have Windows 7 set to use UTC in the hardware clock using this registry hack:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]
‚ÄúRealTimeIsUniversal‚ÄĚ=dword:00000001

I am in UTC - 5 timezone. Every so often (probably every 30-40 minutes), my Windows clock is moved backwards five hours (so if it is 2:00 PM in my timezone, it will set my time to 9:00 AM). This requires me to go in and manually push the clock forward.

I have internet time synchronization and daylight savings adjustments disabled.

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Are your regional settings correct? –  Shutupsquare Jan 18 '13 at 19:13
    
What does your hardware clock (the one on the BIOS's boot setup page) read? –  BobT Jan 18 '13 at 20:32
    
Would reversing the registry hack, and using the convention method of controlling the system date / time help? –  Guy Thomas Jan 18 '13 at 20:44
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