Whenever I try to download and start up minecraft the launcher tells me this:

Unable to save download. ar_sa.lang
Name: ar_sa.lang
URL: http://resources.download.minecraft.net/3b/3b07db82a303676324771ec0597715b584c91466
Error details: Attempting to move successful download to C:/Users\danny\AppData\Roaming\.minecraft\assets\objects\3b/3b07db82a303676324771ec0597715b584c91466
The process cannot access the file because it is being used by another process
Filename on disk: 43fa-1702-913d-01a0
Path: C:\Users\danny\AppData\Local\Temp\43fa-1702-913d-01a0
Exists: file