The Microsoft Product Team Blog is discussing one of the Vista Service Pack 1 (SP1) prerequisite updates, the Servicing Stack Update (SSU) — KB937287 — which contains the SP1 installation program.

“Back in February, we posted about the release of a couple of prerequisites for Windows Vista Service Pack 1. While several million customers installed the updates successfully, you may have read that a few customers experienced an endless reboot cycle while installing one of the prerequisites: KB937287 …”

As posted last month on the Windows Vista blog, we suspended automatic distribution of the SSU while we investigated the problem. Over the past few weeks, we’ve learned a lot more about the problem and have taken steps to address the issue. Today, we’d like to let you know that we are resuming automatic distribution of the SSU tomorrow and provide more clarity on what happened. To clear up any concerns for those of you who have already installed the update: There is no problem with the files that make up the Servicing Stack Update (KB937287); the problem some customers encountered was with the installation process for the update.

If you have downloaded this update, you may like to read the whole article.