Yes, it makes a difference that you’re running on a laptop. Windows limits your refresh rate to its default, 60hz on 2000/XP.
The refresh rate settings won’t matter that much. On an LCD the pixels are constantly illuminated, where as on a CRT they are "painted" on by an electron gun. The technology is different so the term has different meaning when applied to one or the other. For the most part you can ignore refresh rate as you'll not see the annoying redraw scan of a CRT. It may come into play for a LCD when discussing 3D software like games though. It effects response time, or the time it takes for a pixel to go on & off; so you might get blurring or ghosting of an image.
Anyway, if you want to, the next step would be to update your video card drivers. Looking at the specs your drivers are dated 9/2005; updated drivers for your card came out in March, 2006 I believe.
As a general rule you shouldn't update your drivers unless you are having problems or the latest drivers have new features that you want to take advantage of. Updating your drivers can be tricky and you need to feel comfortable doing this. Find someone to help you possibly... Do a bit of research... Scour the net for info...
You should get your drivers from the
Dell Support site;
Nvidia has an all-in-one driver package, called Forceware, and the driver for your card may be included but I'm not sure. I'd think Dell would be your best bet since sometimes a manufacture may adjust settings specific to the hardware.
The Dell Support site has a community forum section that would be a good place to get help if you need it. Another good place would be the
Nvidia forums.
If you really want to get the most out of your card, try asking at both places about driver mods or tweaks... Some people are modding standard driver inf files to fix problems. There are also replacement utilities or tweaks to the Nvidia Control Panel and also specific utilities to unlock hidden items like the refresh rates (the inf mods will also do this I believe). There are plenty of tweaking sites on the web...
LaptopVideo2Go - the #1 source for modded Nvidia drivers
Good luck!