Avast MAC Security will not move file to chest

I have a MACBook Pro (2011) with a partitioned HD, running Yosemite 10.10.1 and Windows 7 Pro.
Ran Full scan on MAC side. It returned 2x infections (Win32:Malware-gen) on the windows side.
AVAST will NOT move infections to quarantine “Chest operation failed” “Failed to chest /Volumes/Local Disk/Windows/SysWOW64/scrnsave.scr: Bad file descriptor.”
Path File is: /volume/local disk/windows/syswow64/scrnsave.scr
Windows side AVAST does not detect the virus. Any ideas? Thanks