Some helpful resources for Windows 7 Service Pack1:

You receive 0x800f0904 - CBS_E_MORE_THAN_ONE_ACTIVE_EDITION when installing SP1 for Win7/R2

Windows 7 Service Pack 1 fails with error code 0x8004a029

Windows 7 Service Pack 1 fails to install with 0x800f0a13 or 0x800f0826