My Minecraft Says its unable to save a download.

I've looked at some sites and have no anti virus or anything.
it says this
Name: fa_ir.lang
URL: http://resources.download.minecraft.net/1a/1a818610f35178a7dc77d480ca11e1bce45459d2
Error details: Attempting to move successful download to C:/Users\Administrator\AppData\Roaming\.minecraft\assets\objects\1a/1a818610f35178a7dc77d480ca11e1bce45459d2 There is not enough space on the disk
Filename on disk: 1fe4-0196-4b61-cca4
Path: C:\Users\ADMINI~1\AppData\Local\Temp\1fe4-0196-4b61-cca4
Exists: file

Im not sure what this means, but please help as soon as you can.
Thank you.