What I'd do is select ALL files in the chest that are flagged as Win32:Delf-MZG (i.e. restore by Virus name and select all Win32:Delf-MZG items - for most people, this will be all the files in the Chest) and use the "Restore" command.
To verify that it worked, you can do the same for the second time -- this time, you should be getting prompts whether you want to overwrite the files then (as they would already exist).
Please note again, that the files will stay in the Chest even if they are correctly restored. I.e. "Restore" in fact means "Copy out from the Chest".
Thanks
Vlk
PS Before doing this, MAKE SURE you have the latest virus definitions (i.e. you're still not using the buggy VPS 091203-0 that was causing the problem).