The original ISO for Microsoft System Center 2012 Configuration Manager SP1 contained a nasty little bug that prevented the ConfigMgr client from installing.

The problem was that the authenticode signature for MicrosoftPolicyPlatformSetup.msi, a required component of the client agent, was expired.

I discovered a few others had experienced the same thing (Client push fails with Authenticode Signature error).

Thankfully Microsoft only wasted about 2 weeks fixing the problem.  You can read additional details about the situation at myITforum, the official KB article, and Windows-Noob.  If you downloaded the original ISO, trash it and download the updated one.

Below is a table of the original ISO and the updated ISO from  per my experience.

Edition RTM
Description ISO of Original release of SCCM 2012 with SP1 integrated
Released ~ 2013/01/01
File Name SW_DVD5_Sys_Ctr_2012w_SP1_Config_Mgr_EndPt_Protection_MultiLang_-2_X18-84756.ISO
File Size 948,314,112
MD5 Hash 53e35591d07de3add537de11056afdc2
CRC32 73c129a0
SHA1 ab930f8fc127d00c510a5fd73038cf16dcfd2290
SHA-256 deda950a915d6a3548722f55ca51af3139bd9c69307b25088777f53908d27255
SHA-384 966842e033d56de87c5b5195d0fac75d3da8e53ec1f689fc1ab3d1e552b7ad6f21e86ddadfbc399c058ade725b143718
SHA-512 ab28694d0495d49620de70d287db972831f2903d1061b20d2324ef603ead56f19a8d019a52abc037bf448970ec53c63bd05013caf2454a5b9ad5889af6042b34


Edition CU0 / Refresh 1 / Cumulative Update 0 / ~whatever~
Description ISO of Refresh release of SCCM 2012 with SP1 integrated which contains KB2801987
Released ~ 2013/01/15
File Name SW_DVD5_SysCtr_2012_w_SP1_Conf_Mgr_and_EndPt_Prot_for_Windows-MultiLang_X18-58783.ISO
File Size 948,322,304
MD5 Hash 069c24f62a51b7296d54c1529808d64e
CRC32 06a2806c
SHA1 877c0b77607e7a580683d8b05d8da7dc548f3bb3
SHA-256 f7b1b5932e7fcd8f32cd1632c0a7a0c55334b9d0600a7a12d40ad8454e907a12
SHA-384 ba59c36e4c4e829dc8168e15ca9489867f1b05ddf4a12cefcf77072e99db0df1e76586af07a52d49a71957ab11b4b374
SHA-512 c71f29244ae84d14721e71ec7294e1450d11e7e1dfbedd284e5f82999176e0260252e5dac6219aae03f8c456c008b8b0655fd2a22d2ffc44a60c628a1d879f86
SCCM 2012 SP1 refresh / KB2801987
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