This might help. "How do you remove recycler virus found in hard disk?"
Use a batch file (Example.bat) to change it from to a non hidden and a non read only file. It will convert it to a deletable folder and delete it. Do not delete the Autorun file because I found that the virus changed one of my documents to the autorun.
ATTRIB -S -A -H -R
Then if no errors come up after running the batch right click on RECYCLER folder and click delete.
Make sure the Batch is in the drive not the subdirectry.
(Example) - DriveLeter>Example.bat
Either that or Avast has reported a false positive.
You could be looking at an mbr trojan according to the description provided on one BitDefender thread seen at http://forum.bitdefender.com/index.php?showtopic=7333
Another thing to suggest would be starting a thread in the security section and post a HiJack This log there to see if one of the security mods can help if none of this works.