Windows 7 SP1 failing to install

Got a user with a failing Windows 7 SP1 install (delivered via SCCM Software updates). Windows Update Log shows:

2012-01-23 11:14:13:119 7000 1d7c Handler : WARNING: Command line install completed. Return code = 0x80073712, Result = Failed, Reboot required = false

2012-01-23 11:14:13:119 7000 1d7c Handler : WARNING: Exit code = 0x8024200B

2012-01-23 11:14:13:743 3668 62c COMAPI - Install call complete (succeeded = 0, succeeded with errors = 0, failed = 1, unaccounted = 0)

2012-01-23 11:14:13:743 3668 62c COMAPI - WARNING: Exit code = 0x00000000 Call error code = 0x80240022

2012-01-23 11:14:18:544 1044 153c Report REPORT EVENT: {660A059D-EE72-4602-BE10-00F2C13E88E5} 2012-01-23 11:14:13:540-0000 1 182 101 {69E38AA3-5145-449F-AC7E-F01C3209D9CF} 101 80070643 CcmExec Failure Content Install Installation Failure: Windows failed to install the following update with error 0x80070643: Windows 7 Service Pack 1 (KB976932).

I have run System Readiness Update Tool, which can't fix it:

Checking Component Store

(f) CSI Manifest All Zeros 0x00000000 winsxs\Manifests\msil_mscorlib.resources_b77a5c561934e089_6.1.7600.21005_en-us_4fda68268f2277db.manifest msil_mscorlib.resources_b77a5c561934e089_6.1.7600.21005_en-us_4fda68268f2277db

(f) CSI Manifest All Zeros 0x00000000 winsxs\Manifests\msil_mscorlib.resources_b77a5c561934e089_6.1.7600.16847_en-us_66abdf547577b625.manifest msil_mscorlib.resources_b77a5c561934e089_6.1.7600.16847_en-us_66abdf547577b625

Unavailable repair files:

winsxs\manifests\msil_mscorlib.resources_b77a5c561934e089_6.1.7600.21005_en-us_4fda68268f2277db.manifest

winsxs\manifests\msil_mscorlib.resources_b77a5c561934e089_6.1.7600.16847_en-us_66abdf547577b625.manifest

What can I do?

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