virus/ Butano[trj]

Avast 4 indicated that I had a virus on my sytem by the name of Butano[trj]. I have looked in the virus definitions at the Avast website and I could not find this virus listed. AQny thoughts?

thanks for great Avast software.

Take a look at this link: http://www.virusbtn.com/resources/vgrep/vgrep.cgi?terms=Butano&product=1