You have an issue with installing Windows Updates on the computer. The error code that you receive is 8024800A.
It must be difficult when something that is important to you does not work as expected. I will help you fix the issue.

I will give you step by step instructions to get the issue fixed.

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

pause

d) Wait for the process to complete.

e) Close the Command Prompt.

Now, go to Windows Update and try installing the updates.

Source: Here!