Microsoft reveals that Vista SP1 and Windows Server 2008 RTM/SP1 will incorrectly report Intel Core i7 (Nehalem) processor errors under the label Event 19. According to the software giant, the issue only affects copies of Windows Vista SP1 and Windows Server 2008 that have the Windows Hardware Error Architecture (WHEA) feature enabled, and which are running on systems with Intel Core i7 (Nehalem) processors. The error reports are erroneous, as the issues are not related to the Core i7 (Nehalem) CPUs but rather to the system memory.

More info: KB961080