Help Me :( MC Forge not opening on start up..

This is the message I get when trying to play my 1.7.10 MC Forge game.

But I can launch any non Forge related games.

I am not tech savvy at all, I know I should have a clue but I don't.

I looked around on Google and Youtube and gathered enough about it being an issue with Java, but I don't want to do anything without being for sure on it.

[22:25:32] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[22:25:32] [main/ERROR]: Unable to launch

java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker

at java.net.URLClassLoader$1.run(URLClassLoader.java:372) ~[?:1.8.0_25]

at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[?:1.8.0_25]

at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_25]

at java.net.URLClassLoader.findClass(URLClassLoader.java:360) ~[?:1.8.0_25]

at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) ~[?:1.8.0_25]

at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]

at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]

at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]

at java.lang.Class.forName0(Native Method) ~[?:1.8.0_25]

at java.lang.Class.forName(Class.java:344) ~[?:1.8.0_25]

at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.12.jar:?]

at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]

Java HotSpot 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release