Computers with an AMD processor running Microsoft's DirectX 8.1 software may shut down without warning, according to the software giant.

An error in the AMD-specific optimised code causes the DrawIndexedPrimitive function, which enhances the PC's multimedia capabilities, to stop working without displaying an error message to circumvent a system crash.

Microsoft has issued a patch on its website for PCs experiencing this difficulty.

But as the fix has been put together quickly it may need extra testing. Microsoft has therefore recommended that only those who have suffered this problem apply the patch at this time.