Article ID: 930164 - Last Review: September 10, 2007 - Revision: 1.4

You receive the installation error message 0037-80070643 when you try to install Windows Live OneCare

When you try to install Windows Live OneCare, you receive the following error message that has the error code 0037-80070643:

Installation did not succeed
An error occurred during Window Live OneCare Installation. Please contact support.

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CAUSE

The Windows Live OneCare service was not installed correctly because of permissions-related problems in the registry.

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Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, visit the following Web site:

http://support.microsoft.com/kb/256986 (http://support.microsoft.com/kb/256986)

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

Modify the permissions, and then delete a registry key that is related to Windows Live OneCare. To do this, follow these steps:

Close the Windows Live OneCare installation program.
Open Registry Editor:

Windows Vista
- Click Start
  Collapse this imageExpand this image
  , type regedit in the Start Search box, and then press ENTER.
  Collapse this imageExpand this image
  If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
Microsoft Windows XP
- Click Start, click Run, type regedit, and then click OK.
Locate the HKLM\Software\Microsoft\WinSS registry key, and then expand the WinSS registry key.
Locate the following subkey:
{74F777F9-6EB9-4939-9707-C5026A1FAB6F}
Right-click the {74F777F9-6EB9-4939-9707-C5026A1FAB6F} subkey, and then click Permissions.
In the Permissions dialog box, make sure that Administrator Group has Full Control, and then close the dialog box.
Manually delete the {74F777F9-6EB9-4939-9707-C5026A1FAB6F} subkey.
Restart the computer, and then reinstall Windows Live OneCare.