system
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Hi there Andei: 
Once you moved those trojans to the virus chest… they are contained and will not cause any further damage to the system.
So you can not delete the files from within the chest? ???
Right click each file in the chest and see if you can choose the delete option.
Post your results. 
EDIT: Start the avast program interface… right click anywhere on the avast window screen that pops up where you manualy scan for viruses , and select virus chest. Thats just in case you did not know how to get there. Hope it works.
Kindest Regards,
~Steele Wolf~