I am having what at times can be regular occurances (about 8 - 12 times since 5pm to now midnightish) of the dreaded BSOD

I have managed to gleem a little bit of info from the blue screen before the official restart occurs and the last few have been relating to a file (or something) named dxgkernel.sys (or very similar).

I have tried to no avail searching GZ and Google for possible causes and I do come up with that this particular one is a Direct X Graphics Kernal issue where they suggest reinstalling the graphics driver.  Problem with this is that I actually have the newest driver from the ATI website (this was updated approx a week ago).

I am relatively good at finding and fixing issues normally but this has got me stumped so any help would be appreciated.  Especially since this is effecting my whole pc experience quite badly.

I use my pc as a HTPC setup details as follw  2.33 quad core, 4 gig of ram, win 7 ultimate 64bit, HD4870 graphics card (pretty sure it's 1 gig hehe sorry but it's late and am tired).

This is the most recent crash but that stated the problem was atimpag or atimdag.sys file.

Problem signature:
  Problem Event Name:    BlueScreen
  OS Version:    6.1.7600.2.0.0.256.1
  Locale ID:    5129

Additional information about the problem:
  BCCode:    1000007e
  BCP1:    FFFFFFFFC0000005
  BCP2:    FFFFF8800312A120
  BCP3:    FFFFF88003A229B8
  BCP4:    FFFFF88003A22220
  OS Version:    6_1_7600
  Service Pack:    0_0
  Product:    256_1

Files that help describe the problem:
  C:\Windows\Minidump\083110-19032-01.dmp
  C:\Users\John's\AppData\Local\Temp\WER-56987-0.sysdata.xml