cant play launcher error

the launcher is not working it says error..... i send you the details that it says
Unable to save download. sand4.ogg
Name: sand4.ogg
URL: http://resources.download.minecraft.net/37/37afa06f97d58767a1cd1382386db878be1532dd
Error details: Attempting to move successful download to C:/Users\pc\AppData\Roaming\.minecraft\assets\objects\37/37afa06f97d58767a1cd1382386db878be1532dd
The process cannot access the file because it is being used by another process
Filename on disk: 00fe-5070-61cf-fb2b
Path: C:\Users\pc\AppData\Local\Temp\00fe-5070-61cf-fb2b
Exists: false