Problem when adjusting screen resolution

Hi everyone!
I have a problem when i start using Win7 and adjust my screen resolution...
when i adjust the resolution to 1206x682 or higher, the whole windows become larger and eventually become larger than my screen. So i can see only part of my taskbar. However, this will not happen when i use XP.
Is this normal?
At this time i can't use any video editing software as they require 1024x768 or higher resolution, what should i do?
Sorry for my poor English. I am still an English learner.
thanks!

UPDATE-----
when i set to a higher resolution in XP, the icons are smaller and the size of the windows doesnt change. But when i do this in 7, the size of icons doesnt change but the whole windows become larger.
SCREENSHOT-----
In 1820x720: (im using a Chinese Win7)

but in 1206x682:

Hi Son, welcome to the forums Hereis a link to the drivers for you're video card NVIDIA DRIVERS 257.21 WHQL if you post a little more info on you're system we may be able to help you further :)

Son said:

pebbly said:

Hi Son, welcome to the forums Hereis a link to the drivers for you're video card NVIDIA DRIVERS 257.21 WHQL if you post a little more info on you're system we may be able to help you further :)

thanks very much for your reply.
i already have the 257.21 driver (international one) but it didn't help.
No matter i adjust my resolution using the nvidea control panel or the Win7 "screen resolution" option the windows is become larger

BTW what system info should i provide?

If you fill in your system secs in the "user CP " at the top left of the forum banner or tell us the make/model of your computer ,we may be in a better position to help you

Son said:

pebbly said:

Son said:

thanks very much for your reply.
i already have the 257.21 driver (international one) but it didn't help.
No matter i adjust my resolution using the nvidea control panel or the Win7 "screen resolution" option the windows is become larger

BTW what system info should i provide?

If you fill in your system secs in the "user CP " at the top left of the forum banner or tell us the make/model of your computer ,we may be in a better position to help you

its a custom built computer so there is no model number, sorry.
but i already filled in as much information as i could. hope it helps!

OK Son you may have to update the chip set drivers for the motherboard

alphanumeric said:

If you go to "Devices and Printers" does your monitor show up, and is it correctly identified? Do you know what the native resolution is supposed to be? I guessing Windows doesn't know what monitor you have connected and that it is a wide screen format. You may have to hunt up a driver (inf file) for it. It is a wide screen 10 inch LCD right?

I think this is a 22 inch screen. Perhaps the solution on this topic might help, Son
Weird Zoom Problem on 7

Son said:

@mitchell65: i think u hv misunderstood my problem. please take a look of the newly uploaded screenshot, anyway thanks!

You screenshot shows exactly what I would expect to see if your display showed more that 100%. Have you done a quick check on the Display details, if so what % is it on?