While this answer may help if you're an admin, it doesn't help at work. So is there a way to get rid of this message without having to bother your admin?
This is just a workaround:
Get ClickOff which you can install (e.g. in your home folder) and put to autorun as non-admin. When that stupid popup apears for the next time, move your mouse over the "later"-button but instead of clicking push Ctrl-Alt-D. From now on every time this plague reappears, ClickOff will automatically click on "later" for you. Unfortunately this way one may still lose keyboard focus every now and then.
Just another workaround:
Move the popup completely to the right bottom corner, so that you see only a small part of it (at worst, it will hide a bit of the hour/date).
This way, it won't be disturbing even if on top, and because it is already open, it won't pop up anymore for this session.
To get rid of annoying windows' automatic update popup.
It will resolve your concern.
Click start then Run (or windows key + r) and type cmd then press enter. Type in the following and press enter:
net stop wuauserv