電腦一login就hang, 可以點搞?

you can go to the safe mode to check whether it works or not.
press F8 when you press the power on.
if you can go to the win from the safe mode,
scan the computer against virus with your antivirus software.
if you haven't install any , you can download "avast"
or "ad aware" . they are good to use and they are free.
have a try.