Same thing as several other responses, error 1603 ("Fatal error during installation") Windows Live ID Sign-in Assistant.
The tail end of my log:
MSI (s) (7C:54) [14:49:18:867]: Note: 1: 1708
MSI (s) (7C:54) [14:49:18:867]: Product: Windows Live ID Sign-in Assistant -- Installation failed.
MSI (s) (7C:54) [14:49:18:867]: Windows Installer installed the product. Product Name:
Windows Live ID Sign-in Assistant. Product Version: 6.500.3165.0. Product Language: 1033. Manufacturer: Microsoft Corporation.
Installation success or error status: 1603.
MSI (s) (7C:54) [14:49:18:867]: Deferring clean up of packages/files, if any exist
MSI (s) (7C:54) [14:49:18:867]: MainEngineThread is returning 1603
MSI (s) (7C:04) [14:49:18:867]: No System Restore sequence number for this installation.
=== Logging stopped: 3/13/2012 14:49:18 ===
MSI (c) (E0:90) [14:49:18:877]: Creating MSIHANDLE (100) of type 790531 for thread 3728
MSI (c) (E0:90) [14:49:18:877]: Closing MSIHANDLE (100) of type 790531 for thread 3728
MSI (s) (7C:04) [14:49:18:877]: User policy value 'DisableRollback' is 0
MSI (s) (7C:04) [14:49:18:877]: Machine policy value 'DisableRollback' is 0
MSI (s) (7C:04) [14:49:18:877]: Incrementing counter to disable shutdown. Counter after increment: 0
MSI (s) (7C:04) [14:49:18:877]: Note: 1: 1402 2: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Installer\Rollback\Scripts 3: 2
MSI (s) (7C:04) [14:49:18:877]: Note: 1: 1402 2: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Installer\Rollback\Scripts 3: 2
MSI (s) (7C:04) [14:49:18:877]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied. Counter after decrement: -1
MSI (s) (7C:04) [14:49:18:877]: Restoring environment variables
MSI (c) (E0:90) [14:49:18:877]: Creating MSIHANDLE (101) of type 790531 for thread 3728
MSI (c) (E0:90) [14:49:18:877]: Closing MSIHANDLE (101) of type 790531 for thread 3728
MSI (c) (E0:1C) [14:49:18:877]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied. Counter after decrement: -1
MSI (c) (E0:1C) [14:49:18:877]: MainEngineThread is returning 1603