Trojan Horse-Won't go to chest-

I hope to get help before trying to close out, PC semi locked. I got a Trojan Horse Found and the instructions say-“Move To Chest”. But when I try I get a warning that says Can’t do it because the file is in use. So it just goes around in circles. The PC is not reaction right and it took awhile just to access this site. I had to just close the Warning box and let the virus go in order to unlock the PC from the Avast warnings. Please advise. Thanks.

Name:JS:FakeCodec-B [Trj]
Type:Trojan Horse
VPS Version:100304-1, 03/04/2010

maybe the website you have entered is infected or being hacked.

Set up a boot scan, then reboot.

Set up and completed boot scan. Same Trojan found and moved to chest. Thank You for the remindered about the Boot-Scan.

Can we know the full name and path of the original file, and if it is still called “JS:FakeCodec-B” in the chest?
Any idea how you might have got it?
I would also try a second malware scanner, to clean up/peace of mind etc. MBAM is very good, and often recommended.
If it finds anything you may wish to post the scan report.