Site for info:

Troj/JetHome, Sophos

A JavaScript variant, similar, is at:

Troj/JetHome-M, Sophos

Note that the "usual" link is to sp.dll, but that can be changed by any a-hole that restarts this one.

Note also, that dll link failures are common enought that it remains likely that the problem cited is just a setup glitch.

John