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On two computer systems, I have fully legal and validated Vista 64-bit installs. On both machines, I use the Windows Update system to ensure I have all the latest patches and updates. Both machines pass Microsoft's "Genuine Advantage" checks. In both cases, the machines are running service pack 1. According to Wikipedia, Microsoft released Service Pack 2 for Vista on April 28, 2009, and it was released to Windows Update on May 26, 2009. Neither computer system is "seeing" SP2 as an available upgrade. Why not?

Both systems have seen more recent critical and important updates, and I have applied these. On one system, I downloaded SP2 and applied it manually. The other system was assembled and had Vista installed in the past month, but still did not see SP2 as an available update (the Vista disk was an OEM version with SP1 integrated).

Update: Strangely enough, after posting this article, SP2 was pushed out by Windows Update to the machine which did not already have it installed. Also, to a laptop I had forgotten about. I'm not sure why Windows Update had this change of heart, perhaps Microsoft reads Superuser.com. :)

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up vote 1 down vote accepted

You can try reviewing this Knowledge Base Article - Windows Vista Service packs not available for installation via Windows Update

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Marking this as the accepted answer because of the link to the knowledge base article. It did not specifically help me, but I expect it would be the correct solution for most people. I know I've been burnt with the vLite stuff before, though the knowledge base article gives false information on that particular topic. –  ChrisInEdmonton Aug 6 '09 at 15:31
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I couldn't upgrade yet because the Software Licesing service was not running (I guess now it's irreparable, though my Vista is legal and validated), but I can't update to recent patches. I don't know why you can't see the SP2 update, but I guees you could try to download it manually.

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