What is BV: QHhost [Trj]?

I am using Avast! 7.0.1426 on Windows XP SP3. Avast! and all critical updates are installed.

Scan results indicated that BV: QHhost [Trj] was found. Not knowing what is I placed it in the virus chest. It seems to be from the Hosts file which as far as I know is just a .txt file. In addition, My Hosts file has disappeared.

I tried Googling BV: QHhost [Trj] but I just keep finding slightly different version names of the file and only in different languages, I only speak/understand English.

Could this just be a false positive?

I think I may have failed in submitting a log to Support. I would attach it here but it is in a zip file and over 200KB and the contents is way over 200KB.

Thank you for any help you can provide.

Charlie