Open SecurityCenter and go to Navigation, scroll down to Quarantined and Trusted Items
Open those sections and it should be awaiting your action and may possibly have a path to where it was originally and a more explanatory name.
Meanwhile I would do a scan with some extra tools such as AdwCleaner and Malwarebytes Free, see last link below.
Note: to keep the latter free of charge do NOT accept the free trial or activate it if asked.
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Trojan-FETB is probably the same detection as Microsoft's "Trojan:Win32/Tracur.BN".
The "FETB" comes from an add-on program by the name of "FraudEliminator Toolbar" so if you have any browser add-ons or extensions, or toolbars, with that name you should remove them at once.
FraudEliminator is, or was, available for download from PCWorld and CNET among others. It's probably best described as a PUP, but the downloaders which provide you with the toolbar may be suspect because they could also bundle unwanted or malicious programs with the download.
There is a highly dismissive review at http://www.pcreview.co.uk/forums/fraud-eliminator-t1990292.html
The fraudeliminator[dot]com website is all in Japanese, and as I haven't got Google Translate on Firefox I can't say anything about it right now.