Error 1714 when installing BOINC on Win 7 x64

I wrote about this issue a little more than a year ago and the responses did not solve my issue so I'm posting again in hope that new eyes may see a solution.

My PC is Win 7 Ult x64, 8 GB RAM, 1.5 TB HDD. I had BOINC running on it and did an upgrade that hosed the existing install. I believe I had 6.10.58 onboard and went to 6.12.34. I received error 1714 and so it began.

I have done:
Removed 6.10 via Add/Remove programs. Reinstall of 6.12 failed
Removed 6.10 via Windows Uninstall utility Reinstall of 6.12 failed
Ran regedit and removed all mentions of BOINC, setiathome, Space Services (top level folder for BOINC), removed all folders reflecting BOINC or other related folders. Reinstall of 6.12 failed
Ran through the above again, and tried to reinstall 6.10, that failed too with error 1714.
I've downloaded 7.0.28 that fails with the 1714 error.
I've tried the 7.0.42 it failed, but it's x86, I just wanted to see what would happen.
I have sanitized my machine as best I can regarding BOINC software and any potential leftovers and am still at odds as how to make this work. I have the 7.0.28 (x64) running on 2 other Win 7 boxes and a Win 8 box all without incident.
What am I missing and just how do I fix it?

Thank you.
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Or see the options in this BOINC FAQ:

Windows Installer Error 1706: Setup cannot find the required files / 1714: older version cannot be removed / BOINC.msi cannot be found / The feature you are trying to use is on a network resource that is unavailable / Error 1325. is not a valid short name
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Jord

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