hi,
do u use wlan with ur faster computer?
and with your slower computer lan ? or maybe a virus ?
Mh, we dont know any informations about your pc etc. and u want an answer from us ? xD.. well, try it again with lan, and do a virus scan with

..
THE BEST IDEA:
try to login INGAME, if you can login, you arent banned.
srsly for my bad english, im on with ipod touch and my english isnt
soo good.
best regards, thecoon324