cant save download file

Unable to save download. death.ogg
Name: death.ogg
URL: http://resources.download.minecraft.net/32/323880d656a3ca6b42ac9890857dcfc9b354cdbf
Error details: Attempting to move successful download to C:/Users\giles.dudley\AppData\Roaming\.minecraft\assets\objects\32/323880d656a3ca6b42ac9890857dcfc9b354cdbf
The process cannot access the file because it is being used by another process
Filename on disk: 4731-1ad7-9ffc-96f8
Path: C:\Users\GILES~1.DUD\AppData\Local\Temp\4731-1ad7-9ffc-96f8
Exists: file