Failed to download file. icon_16x16.png

When I click on the Minecraft icon I keep coming up with the same error.
The message reads as follows;
Name: icon_16x16.png
URL: http://resources.download.minecraft.net/bd/bdf48ef6b5d0d23bbb02e17d04865216179f510a
Error details: HTTP 403: Forbidden: header 'Content-Type' value denied
Filename on disk: 3689-0834-5da9-191c
Path: C:\Users\lcupps\AppData\Local\Temp\3689-0834-5da9-191c
Exists: file