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Easy Steps to Fix Windows Update Error 8024800a
1) Rename the Software Distribution Folder:
Now reboot your machine
2) Check Software Distribution Settings:
3) Run SFC:
4) Re-Register Windows Update API:
5) Restore The System:
6) Run Registry Scan:
This solution worked for me with Windows 7. It was supplied by Microsoft at this link. It also appears to have worked for dozens of others with the same problem.
a) Click on “Start” and type “cmd” (without the quotations).
b) When you see the “cmd” icon, Right Click on it and select “Run as administrator”.
c) On the open Command Prompt window copy and paste the commands (all at once) –
net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver
d) Wait for the process to complete.
e) Close the Command Prompt.
Now, go to Windows Update and try installing the updates. This should fix your problem
I'm not sure what caused it to start popping up, but it's been somewhat "popular" over the past couple of months. I found an answer from Microsoft that should help you fix it.