regular system freeze on fullscreen

[Freedomshock]

Oki so here I go ^^
My comp's been having trouble with freezes when I try to watch movies fullscreen, when I stream several on my browser (not fullscreen), sometimes when I use mediacenter and in some other situations when I'm multimedia multitasking (this includes heavy duty work on photoshop)

At first I thought it was a faulty intallation, so I reinstalled windows vista once, didnt work so I checked with Ubuntu and SuSe: same problem.
Of course, this was after I updated the bios in case that was the problem.
I then started with "Ozone3D" benchmark testing for 8 hours...no problem whatso-ever.
I also used the "ATITool" to check my graphics card.

The games like divinity 2, assasins creed 2, dragon age origins and risen used to crash with the same error untill I un-overclocked my graphics card, now I run all games without trouble or crash.

Here is my rig:

-windows 7 ultimate 64 bit
-core2due 3.0Ghz E8400 6mb cache
-4 GB ddr3 RAM
-ati radeon 5770 1Go ddr5
-22" screen samsung
-700 Go harddrive samsung HD753LJ

I'd put in here the dmp file but it seem I cant on this site, so...

bccode 124
local ID 1033 or local ID 1036 depending on the crash

I due hope someone can help me, its becomming frustrating ^^

[Sharanya]

The full screen problem which you are facing while running the video is may be because of the video card drivers are not working properly. I think the the video card drivers are corrupted. Try to reinstall the video card drivers and check whether the problem persist.

[Amd Athlon]

Check out for the video card is properly installed to the system. It could be that the device is not been installed or initialized well and hence it is not able to support well to the system also as you are using Windows 7 operating system it is necessary that you use upgraded drivers for making the device to cope with the system well. So do look out.