If you are using Windows 10, there is no real way to stop it from trying to update, unless you remove its internet access.
What kind of update is it trying to do?
Not sure, it just says a software update but if I leave it to update I am unable to use my laptop and not sure how long it would take/if it would ever actually finish updating. I have left it to update for 48 hours before and I just had to turn the laptop on and off a few times to get it to stop