ServiceName Tunnel

Hello, could someone tell me what this is: ServiceName Tunnel..........................DriverFile name- system32\Drivers\Tunnel.sys........................Device installed Root\*6to4MP\0008............................PrimaryService True......................UpdateStatus True.................I got this data from the event logs.Every once in a while windows tries to install a wireless 6to4 adapter. It doesn't install and I delete it. I can't figure out how to stop this in the future. Is there a firewall setting that will stop this?.Is my PC infected with something or is my ISP doing this?..Thanks for any help.Paul