this sounds similar to my problem, posted right after yours. @_@
Hey, I just read your problem, I've not yet run any diagnostic tools, so I can't really comment on the likeness of it being the same issue.
What is odd, is that she did
mention that it sometimes also occurred when she plugged in the internet cable. But I thought this to be too general to mention in my first post, as she didn't specify in which mode this occurred, or what other conditions were applicable in this situation (as this must mean she at least once was able to continu past the login screen and nothing locked up).
A first guess would be to boot it when it's not connected to the internet and check in Device Manager if there's a driver conflict with the Network Interface Controller (network card), it's signaled by a yellow exclamantion mark next to the name of the hardware item that's causing the conflict. Another thing I would want to try is if it occurs both with the wired and
wireless connection, as this could perhaps give a clue as to where things are going wrong.
Ofcourse, this is mere speculation on my part, and therefore I suggest to merely inspect, and not alter, any information you encounter, unless you know what you're doing. The last thing you need is extra problems on top of the original one.