Guides

If the restore button in windows defender is not doing anything to a file that was on a network drive it may because it is trying to use admin privileges to restore the file to a user mapped network drive.

Try running "C:\Program Files\Windows Defender\mpcmdrun" -restore -listall in an admin cmd prompt to list the quarantined files and "C:\Program Files\Windows Defender\mpcmdrun" -restore -all to restore them all.

If it produces the error QuarantineRestore failed 0x80508014 then try using "C:\Program Files\Windows Defender\mpcmdrun" -restore -all -path %userprofile%\Downloads to restore the files to the downloads folder.

Another option is to use the registry edit in Network Drives that gives applications running as admin access to user shares.