Clear your browser cache/temp internet files.
I doubt that this JS:downloader-FE [Trj] malware is detected by many other AVs as it is contained within the javascript in .htm pages.
Where were the Jave:Agent-B [Trj] detections found, file name and location, thanks ?
What avast version are you using 4.8 or 5.0 ?
- If you have Win2k, XP, vista or Win7 (all 32bit), you could enable a boot time scan.
For 4.8 - Right click the avast icon, select Start avast! Antivirus, a memory scan will take place followed by the opening of the Simple User Interface, Menu, 'Schedule boot-time scan...' Or see
http://www.digitalred.com/avast-boot-time.php. Don't opt for deletion (you have no options left), always send to the chest and investigate.
Look in the C:\Program Files\Alwil Software\Avast4\DATA\report\aswBoot.txt file, check this file using notepad and copy and past the info on the detection.
For 5.0 - From the avast UI, Scan Computer, Boot-time Scan, Schedule Now button and reboot. Send any detections to the chest.