Software

if you are connecting to Kazaa and other music share sites you are no doubt loaded down with Malware/SpyWare.
Run SpyBot Search & Destroy 1.3 updated and AdAware 6 updated and remove everything they fiond. Look in your hosts file to make sure it looks like this:
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host

127.0.0.1 localhost

Only the above line should be uncommented with #