This has been going on for a few months now and I have tried a number of things. At first I thought it just seemed to happen randomly when I used the internet that I would open a new page and just get an immediate blue screen with the message "BAD_POOL_CALLER". However, after some observation I have determined the most frequent triggers are: Any page that has a map application, like Google maps or Mapquest Itunes Music Store Bittorrent However, it does not happen 100% of the time on these and has happened on other, seemingly random pages. Windows update tells me all my drivers are up to date. Device manager, on the other hand tells me that one of my graphics cards has a driver error but the other one is fine (even though they both use the same driver? They're ATI Mobility Radeons 3870 X2 that are crossfired). I'm not sure what to make of this. I have been running CCleaner to try and fix my registry (this seems to temporarily reduce the frequency of the problem, but it always comes back...sometimes in an hour, sometimes in a week). The symptoms of the problem seem more to me like this would be related to a networking driver than a video one, though.