The following error is logged in the Ccmsetup.log file when you install the System Center 2012 Configuration Manager Service Pack 1 client:
Couldn’t verify ‘C:WINDOWSccmsetupMicrosoftPolicyPlatformSetup.msi’ authenticode signature. Return code 0x800b0101
This issue occurs because the MicrosoftPolicyPlatformSetup.msi file is signed with a digital certificate that does not have the proper timestamp attributes. Microsoft Security Advisory 2749665 has more information on this certificate issue.