Vista - Windows Date and Time GMT problem

I am using Microsoft Windows Vista Home Basic, and under Windows Time (Date
and Time) I've set up an additional clock for GMT (UTC)...so, I gave the
clock the name UTC, set it's time zone to GMT Grenwich, Dublin, London, etc.
from the drop down list.

Now, I goto a site that uses UTC and my UTC/GMT clock is one hour fast...the
only thing I can think of, is because we are observing daylight savings time
here in the U.S....but UTC does not observe daylight savings time.

I hope this is the right place to post this...hehe, I kinda new to
newsgroups.