Vista - Daylight savings time and external hard drives

Each fall and winter I deal witht he same problem. When the daylight savings
time comes into effect the time stamp for files on my external portable hard
drive are 1 hour out from the time stamps for the files on my Desktop hard
drive

I then need to delete my files off my external portable HD and then recopy
the "updated time stamp files" external portable HD.

Is there anything I can do to prevent this from happening. I have tried
hooking up the external portable HD to my desktop before powering up the
desktop the morning after daylight savings time has taken effect, but while
the time stamps change on my desktop HD and our network drive the external
portable HD time stamps do not.

Any suggestions?

Thank you for your assistance.