Your PC are invaded by other harmful programs with Name not Avaibable.
Name not Avaibable is regarded as Adware and Potentially Unnecessary Programs spreading advertisement of its cooperator. Lots of users reported that Name not Avaibable caused terrible performance when they browse webpages with Internet Explorer, Firefox and Chrome. In fact, free programs like Name not Avaibable usually comes along with spyware, hijacker and other adware.