Standby problem

[D.Arbib]

XPpro/SP2.IE7

I installed some Microsoft updates on Jan 6th to 9th and since then I have had problem with Standby

Computer will go into Standby but is not shutting down the motherboard and its fans and I measured the current drain as 28 watts

Before the updated Standby turned everything off and the current drain was only 5 watts

I have a secondary drive and had not installed the updates and Standby worked as expected. Then installed the updates an the problem returned.

I believe there is a registry fix, but need help please. So far Microsoft UK have not helped, but did suggest that nVidia video driver could be at fault

but this doesn't mkae sense as I had installed the driver on my secondary drive anyway.