vista says fullscreen mode not supported for this system

i have vista ultimate and when i run my TC (turbo c ) and press ATL+ENTER it
says that fullscreen mode is not supported in your system.help me

What make/model video card do you have? What resolution are you running?

might try and get updates for your video system.
check he manufacturers site for updates.

i have not installed any video card
i have DG35 intel chipset motherboard
resolution is 1440*960
all of my friend using VISTA are suffering by d same problem

Of course you have a video card. Look at your system specs. It's probably an
Intel onboard chip. Do you have a laptop?

I Googled "Turbo C" and find that this is an ancient compiler.

http://en.wikipedia.org/wiki/Turbo_C

So what is it exactly that you're trying to do? If you are trying to run
this very old compiler in Vista (why?), it is not surprising that full
screen isn't supported. Turbo C's native operating system was MS-DOS which
hasn't been part of a Microsoft operating system since Windows ME.

If you have some compelling reason to run an obsolete compiler, then you
should either live with Vista's DOS emulation or use virtual software
(Virtual PC 2007 or VMware for ex.) to create a virtual machine running an
OS in which Turbo C will run properly.

The problem relates to the Vista graphics driver model (WDDM)

there are a few options to workaround this problem with full screen Mode. Emulators are one (dosbox)

their has been a suggestion from microsoft that you install the xp driver version for your current video card.

<http://support.microsoft.com/kb/926657>

and please also read