open a command prompt, type hostname, record this.
create a folder in your C drive right click, new text file. open it.
put the following in it WITH YOUR HOSTNAME
@ECHO OFF
net stop "wuauserv" && sc \HOSTNAME config "wuauserv" start= disabled
save the file, change the ext from .txt to .bat
go to task scheduler, create task (top right), name it whatever, check the box run with highest permissions. go to actions, run program/script, hit browse, go find your file.
run set it to run at boot and repeat every 5 minutes.
set it to run regardless of whether or not you're logged in.
Hit OK, it's gonna ask for your admin credentials. IF you don't have admin credentials, you shouldn't be doing this anyway, it's not your computer. If you do, put them in. If you DO NOT HAVE A PASSWORD, YOU MUST GIVE YOURSELF ONE. It will not allow you to do this without a password.
Reboot your computer, after confirming it made the task, congratulations, no more windows update.