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] “RealTimeIsUniversal”=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.