When you start Windows Vista, you may receive the following message: When this behavior occurs, Windows Vista is running in reduced functionality mode. When Windows Vista is running in reduced functionality mode, the taskbar does not appear. Additionally, you have limited access to Windows Vista programs and features.

This article describes how to install Windows Vista Service Pack 1 (SP1) when Windows Vista is running in reduced functionality mode because the activation period has expired. After you install Windows Vista SP1, you can access data.

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To install Windows Vista SP1 while Windows Vista is in reduced functionality mode, follow these steps.

Important If you install Windows Vista SP1 while Windows Vista is in reduced functionality mode, you cannot uninstall Windows Vista SP1.

1.	Log on to the Windows Vista-based computer.
2.	After the message that is mentioned in the "Symptoms" section appears, click Access your computer with reduced functionality.
3.	In Internet Explorer, type one of the following URLs in the Address bar: Windows Vista, 32-bit versions http://www.microsoft.com/downloads/details.aspx?FamilyId=B0C7136D-5EBB-413B-89C9-CB3D06D12674 (http://www.microsoft.com/downloads/details.aspx?FamilyId=B0C7136D-5EBB-413B-89C9-CB3D06D12674) Windows Vista, 64-bit versions http://www.microsoft.com/downloads/details.aspx?FamilyId=874A414B-32B2-41CC-BD8B-D71EDA5EC07C (http://www.microsoft.com/downloads/details.aspx?FamilyId=B0C7136D-5EBB-413B-89C9-CB3D06D12674)
4.	Follow the steps to download and to install Windows Vista SP1.

Note After you install Windows Vista SP1, you will be asked to activate Windows Vista. However, access to files, to data, and to programs should not be restricted. This behavior applies only if the activation period had expired. It does not apply if any other non-genuine activity has occurred.

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For more information about the behavior of reduced functionality mode in Windows Vista, click the following article number to view the article in the Microsoft Knowledge Base: For more information about how exit reduced functionality mode in Windows Vista, click the following article number to view the article in the Microsoft Knowledge Base:

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