White screen when installing optifine

[M0DXx]

When I try installing optifine, every single time the screen just goes white, I have:

• Downloaded 1.5.1_HD_U_D1 which someone else said worked completely fine
  
• Extracted it into the modpack.jar found in .technic/tekkitmain/bin
  
• Tried it with and without META-INF
  

I have google'd the problem and youtube'd some tutorials, nothing provided a fix that help me, so I decided to make a thread about it.

Thanks for the help