Wierd graphic problems in game (9400gt)

I have recently purchased a new system with the following specs:

Intel core duo E7400 2.80Ghz
Foxcon G31MX
3GB ddr2 ram
Nvidia inno3D 9400gt
320GB HD

The system is running with Windows Vista 32-bit.

The system runs ok in general use (browsing web etc... ) however whenever i start up a graphics intense program such as world of warcraft i get wierd graphic issues such as:

the system freezing for a small period of time or all together

Floor textures disapear or are solid colors (e.g. solid blue floors)

I have had a few BSOD errors that were related to nvlddmkm.sys however these are not as often now.

I have installed all the latest drivers and it runs a little smoother and for longer, however the problems are still there, the screen recently started flickering with fuzzy wierd pixelated colouring. (see image below)

This happened in game however when exited it still continues as in the screenshot. If i click restart then this stops when it says system is shutting down.

I also run BF Heroes which does not do this however it still freezes every so often.

Can anyone please offer any suggestions on how i could fix this?

i was running on the default settings, the game runs fine untill the textures disapear. I have just tried running the game on the lowest settings available and it did the exact same ... (see screenshot below)

do you have a sound card, wow has had issues with creative sound cards?

it really does look like you have an issue with your graphics card, is it still under warranty?

Yes i only got it on friday lol. Also BH heroes was just working ok then map restarted and the textures also messed up and were all black ... personally i think it is problem with graphics driver and vista, was thinking of installing xp which i belived would solve my problem but i bought the pc with vista and would like it to work with it.

In my Nvidia folder (C:\NVIDIA)however i have 2 folders, "DisplayDriver" & "WinVista",

DisplayDriver>186.18

WinVista>182.08

Device manager says version is: 8.15.11.8618

Before i installed the new driver i uninstalled existing one using device manager in safemode and also all unistalled all nvidia components in the add & remove programs. The WinVista folder however stayed there, i dont know if i can manually delete this folder?

Dont want to overclock as this could void my warrenty

Ok i checked the temperature using GPU-Z ... at start it said it was running at 50oC.

I then run WoW and it went up to a max of 54oC (i can post log file if you want)

After 10 mins it crashed and i got the following message on the desktop when i closed it down:

overclocking it isn't dangerous if you do it responsibly and correctly. everyone here pretty much does it....

dude, this is happening because of the latest nvidia 190 display drivers. i also had similar kinds of problems. switch to 186 display drivers. & njoy overclocking

trust me, i also had similar problem. 190.xx drivers have some weird shaders problems which causes overheating. people who have no problem with these drivers, sure have better cooling in their system & a high end gpu. those who have issues, please atleast try 180 series drivers(i use 186.24), & then comment. please post after trying. your reply would be appriciated

trust me, i also had similar problem. 190.xx drivers have some weird shaders problems which causes overheating. people who have no problem with these drivers, sure have better cooling in their system & a high end gpu. those who have issues, please atleast try 180 series drivers(i use 186.24), & then comment. please post after trying. your reply would be appriciated

dude this is happening coz you have overclocked your gpu memory way over the recommended level.try to underclock it a little bit.

since it is a ddr2 mem module it cannot perform well above 470mhz. so to be on a safe side try 450---- 460 mhz