BSOD with Dec 2008 update

I installed the new update and as Vista is coming up it goes to a BSOD: every time.

Now what?

 

FYI: BSOD with 4.0.3810

In the previous version I had been running at:
CPUs = 4 (out of 8)
Memory = 4096
Video Memory = 256

In this configuration 4.0.3810 crashed with a BSOD every time.

I then lowered the CPUs from 4 down to 1
Set the Memory at 1024
Set Video at 128

I was then able to get Vista 64 running.

Then, one at a time, I set the Video to 256, Memory to 4096 (out of 8192) and CPUs to 1, then 2, then 4 (out of 8) and it is still running.