Minecraft for PC has been working fine for a month. Then it started crashing every time I run it.

I start the launcher, press play and it crashes the moment the Minecraft window opens.
I have tried reinstalling Minecraft, reinstalling java and other methods. but nothing fixes it. It happpens on 1.7.10 & Up(I haven't tried lower versions)

here is the whole log>>> [17:21:48] [Client thread/INFO]: LWJGL Version: 2.9.4