I don’t like when Microsoft makes decisions for me… Until I give a crap about IPV6 or if you need to reset your IP on Vista, do the following…
Make sure IPV6 is not installed on your NIC, then…
From the commandline:
ipconfig /flushdns
nbtstat -R
nbtstat -RR
netsh int reset all
netsh int ip reset
netsh winsock reset
Then reboot