Downloader virus - db.js

I have a Mac running Mavericks and NAV 12. Last week, while attempting to download a manual for my furnace, I picked up a virus called downloader. Every time I start Safari, I receive a file deleted message. A screen copy is attached. db.js is deleted, but it occurs again once Safari restarts. The history file for NAV has this line in it.

 

Jul 15, 2014, 1:29:52 PMAuto Scan: Auto Repair ONdb.jsDownloaderFile Was Deleted

 

I ran a complete virus scan and restarted, but the problem continues.

 

I also see some extra windows open using something called Vidx.

 

What should I do?

 

Thanks.