Clock loses one hour exactly

Since the time change of 4 weeks ago my system clock will not stay on the
correct hour.  I was never prompted that the clock was changed for daylight
savings time as it always has in the past so I did it myself.  Since then it
will not keep the new time it remains one hour behind.  If I manually
correct it anywhere between 1-5 hours later it resets back.  I've can't
figure it out at all.


I've checked Dell's website and run their time.exe patch but it's mainly for
those that are loosing a few minutes at a time.  I'm loosing one hour and
nothing more or less.  Really weird.
I've also run the reg fix for the mexico central time 2  but still doesn't
hold.  My bios time is correct everytime I check it and time sync is off in
the control panel.

Any suggestions?
Jack
Dell 8100
Norton AV 2002
Central time zone