i can't play forge 1.7.10 and i can't download 1.7.10

I can't download 1.7.10 and it says
Unable to save download. lwjgl_util-2.9.1.jar
Name: lwjgl_util-2.9.1.jar
URL: https://libraries.minecraft.net/org/lwjgl/lwjgl/lwjgl_util/2.9.1/lwjgl_util-2.9.1.jar
Error details: Attempting to move successful download to C:/Users\Vibha\AppData\Roaming\.minecraft\libraries\org/lwjgl/lwjgl/lwjgl_util/2.9.1/lwjgl_util-2.9.1.jar The process cannot access the file because it is being used by another process
Filename on disk: 6776-48bc-db06-edc0
Path: C:\Users\Vibha\AppData\Local\Temp\6776-48bc-db06-edc0
Exists: file