Help needed New ATI graphics keeps crashing!

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Having built my new computer and I'm having quite a lot of graphics freezes. My mouse still works but you can tell everything else is frozen. On a few occasions the pc has completely frozen and then I can only press restart.

This is then followed by either a grey or black screen, or fairly random artefacts about the screen. I then get a message from windows - ATI driver stopped responsing and was recovered.

The more I have the computer on the worse it seems to get. I've tried changing drivers from 8.9 to 10.1, then 10.3 but it makes no difference. Strangely it seems not to happen if I uninstall all drivers and use VGA mode.

I have a ATI HD 5770 graphics card, Window 7 64bit, 10666mhz ram.

either this is a driver issue or I have a dodgy graphics card.

Can anyone point me in the right direction?

 

[Viscount]

Ok thanks. Theres some things I can try there.
I also found another thread about this same problem on hardware. see:
http://forums.overclockers.co.uk/showthread.php?t=18132758

Dancer is suggesting changing the clock and voltage values.

note: I have a XFX ATI HD 5770 see: http://www.overclockers.co.uk/showproduct.php?prodid=GX-149-XF&groupid=701&catid=56&subcat=1515

 

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My power supply is a OCModXstream 600W

 

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I appear to have sorted this out now to the extent that its not much an issue now.
My HD 5770 is stable in games now and stable most of the time in Windows. I don't get the amdkmdap error now, but occasionally get dynamic link library crashes, usually if I leave the pc to idle. On two occastions I visible saw Windows 7 turn off Aero itself, then a few mins later switch it back on.

I have updated bios to latest version and changed Dram voltage from 1.5v to 1.64v. My ram is 1.65v and that's the nearest I could get to it. The mainboard does do 1.66v, but when I switch to it the text turns purple colour. I thought that was a sign of something bad so have left it at 1.64v.

Firstly it didn't sort it out and I was looking at other solutions. Then last Friday I noticed the cpu was clocking at 2.00ghz. I checked the bios and the clock ratio was wrong, which I then changed. No idea how this happened I may have knocked in whilst changing the ram settings.

Since then it has been mostly crash free, at least in games which is fine by me.