You don't happen to go to my school do you?
We have the same problem.
I think this is a common problem at almost any university... a rl friend of mine has experienced similar issues at his university. 
Never thought I'd say anything good about Cardiff Uni's IT department, but online enrollment is actually one thing they've always handled perfectly, at least in the time I've been a student here.
On topic, and slightly related. A friend brings his laptop over to my place, the idea being to play Minecraft together. We then spend 3 hours trying to figure out why his laptop is refusing point-blank to connect to my wifi. I figure it's because Cardiff uni made him install all sorts of weird security crap on it before they let him connect it to the university wifi, so I spend ages deleting it all. Still no luck. Finally realise that, because we used to live together a couple of years ago, and I'm now using the same wireless access point we had then, his laptop is simply trying to connect with the old password, which I changed a while ago. Enter the new password into his laptop, and bang, it immediately connects. >_> Three hours wasted.