Trojan Horse?

[stoutfellow]

My AVG threat detector has now, four times, warned me that a certain file is infected with "Trojan horse Generic16.AEXR". The alert does nothing; it claims that the problem has already been quarantined, and poses no threat. Meanwhile, AVG's website denies knowledge of any such Trojan horse; nor does Google give any hits.

Anyone have any idea a) what's going on or b) what I can do to make the damn thing either deal with the problem or shut up about it?