Each Computer Upon Reboot Displays An Error Message Saying The "updates Failed"

I have 4 Win 7 computer that will not up-date, Windows shows 21 updates available (all 4 computers show same), upon reboot system says "Updates Failed". Each computer upon reboot dsiplays an error message saying the "updates failed". rinse - repeat.This started with one computer about a month ago, I now have 4 that are doing it. I have scanned with Combofix, Superantispyware, Rkill, Symamtec's Endpoint, eSet on-line, Panda on-line, Malwarebytes, JRT, ADWcleaner, CCleaner, FSS, awsMBR, and tried the MS FIXIT.

I also tried this procedure:

1) Disabled Windows update Service

2) Deleted all files in c:\windows\softwaredistribution\datastore and deleted files in c:\windows\softwaredistribution\download

4) 3) Downloaded and installed the most up to date Windows Update Agent.

5) Restarted Windows Update Agent, made sure Workstation and Background Intelligent Transfer Services were running.

6) Ran the MS Mr. Fixit program to repair update issues.

7) Ran the Windows update. 21 updates to install (as always).

8) Rebooted

9) Guess what, same issue!

I tried this on ALL 4 COMPUTERS I have with this SAME issue, 2 of which are on the same domain, the other two are laptops. ALL 4 FAILED. All four (4) again show the need to receive 21 updates. All 4 were again ran through the update process, all four (4) again failed post re-boot to take the updates (message stated �up-dates failed� post re-boot)