Eddy
2
If you have chosen MOVE they should be in the chest now and you should be able to put them back from there. But although the system is not properly functioning now, I don’t think it is wise to put files back before making sure they are not harmfull. I don’t think you want your system infected again. 
If you really want to put them back from the chest,
open Avast >advanched interface > virus chest > select the file(s) you want to put back > right click and choose restore.
It looks to me that your system was/is badly infected. Perhaps a restore of the os is a better solution.