hi tyrael..
when it looses the connection next time... before releasing and renewing the IP.. can u see if you can ping the bbc IP address 212.58.224.86 and post the result again..
if that fails try ping the loopback address
either ping localhost
or ping 127.0.0.1
may be worth trying that lspfix i posted earlier
http://www.cexx.org/lspfix.htm
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I'll second whats been posted earlier too... not having an AV or firewall is askin for problems. even after a format the pc can become infected within minutes