Probably because AVG is a well known virus poor anti-virus protection, I'd suggest switching to anti avira premium (though it's a paid program, just uninstall it completely, like all it's settings and etc before the trial runs out. Reinstall it with different details, fake email etc to use it again for another 30days)
But if you don't feel like switching, use an online virus scanner like eset's online scanner, it should do the job.