Example: i usually disconnect her cable when she's working (naughty mr) so i can get the highest internet speed ... when i plug the cable back in my connection works for some time (an hour, maximun 2), then it goes down to zero ... after that unable to access internet unless if i unplug my sister's cable ... i never had this problem with my old PC (i was using XP then ... does it matter ... i guess not cause my sister also has Vista on her computer)