Once again, I encounter a problem with my PC which have been
irritating for months! 
After changing to a new CPU, I experience frequent disconnection
from my connection. I've no idea what went wrong. mIRC and MSN was
often disconnected. Can't browse website. Have to manually
disconnect my connection and connect it again before everything
resume back to normal but always after the reconnection my PC will
become very slow. Internet Explorer takes quite long to load, take
quite long to connect to mIRC and sometimes can't even log on to
MSN. Why is that so?