I use to have the same problem as you did before i did a clean install of Vista. Basically that error message is just telling you that your bluetooth is not connected when you are attempting to release then renew your ip. Try ipconfig /all and find the nic card details, then try to release the ip again. I think in "vista" when we perform an ip release it does it for every component such as nic, wireless and also bluetooth.
To display the basic TCP/IP configuration for all adapters, type:
To display the full TCP/IP configuration for all adapters, type:
To renew a DHCP-assigned IP address configuration for only the Local Area Connection adapter, type:
ipconfig /renew "Local Area Connection"
To flush the DNS resolver cache when troubleshooting DNS name resolution problems, type:
To display the DHCP class ID for all adapters with names that start with Local, type:
ipconfig /showclassid Local*
To set the DHCP class ID for the Local Area Connection adapter to TEST, type:
ipconfig /setclassid "Local Area Connection" TEST