When I try to download the version 1.8/1.7.10 it says this

Unable to save download. az_AZ.lang
Name: az_AZ.lang
URL: http://resources.download.minecraft.net/37/37821cab823859768abfebb8264953ee7e069c17
Error details: Attempting to move successful download to C:/Users\kellum\AppData\Roaming\.minecraft\assets\objects\37/37821cab823859768abfebb8264953ee7e069c17
The process cannot access the file because it is being used by another process
Filename on disk: 9661-311c-1c85-5696
Path: C:\Users\kellum\AppData\Local\Temp\9661-311c-1c85-5696
Exists: false