Trailrunner7 writes "Microsoft on Thursday confirmed that the blue screen of death issues that affected a slew of users after the latest batch of Patch Tuesday updates is the result of an existing infection by the Alureon rootkit. There was widespread speculation after the patch release that simply installing the MS10-015 update was causing the BSOD condition on some Windows 32-bit machines. However, Microsoft said at the time this was not the case and started an investigation into the problem. In an advisory released Thursday, the company said that it now was confident that the restart problem is being caused by the Alureon rootkit."
That seems a harsh way to find out that your Windows machine has been rooted.