Well, in the "Advanced" Display settings, depending on what video card driver
you have installed, you probably have a "Display(s)" tab, for which you use to
configure your monitor. If the monitor is old, or just flat out does not
support DDC communication, then it may be set to 60Hz since it cannot detect
what monitor it's connected to and what it's max refresh rate is.
Also, on the Monitor tab, it should tell you what kind of monitor is connected
and the current refresh rate. Keep in mind, on this tab, it should say the
monitor is either "Plug and Play Monitor" or list the actual make/model of your
monitor. If it just lists "Unknown monitor" or "Default Monitor", then you
should change it to Plug and Play Monitor... that MAY be a reason for it not
going to the refresh rates you are trying to get.
Hope this helps,
Tim