Can't install Minecraft Forge src code?

I've been trying for two days to start making a mod for Minecraft that is compatible with Forge. I downloaded the 1.6.4 Recommended src file, went to the install it and when it finished, it said "Something failed verifying minecraft files, check log for details. Decompile exception: 1".
WHAT THE HECK HAPPENED. Also, I can't find the log. When I go to C:\Users\admin\Desktop\forge\mcp\eclipse\Minecraft, there's no src code like there's supposed to be. I'm beginning to get really irritated by this, I've been trying to get this **** to work for 2 days. What the hell do I do?