When i try to run minecraft this appears in the console: http://pastebin.com/gc1ZTS7A

Nevermind. I figured out i need jdk 7

Now i am getting this Error:

 

[16:38:56] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[16:38:56] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[16:38:56] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

[16:38:56] [main/INFO] [FML]: Forge Mod Loader version 7.10.18.1180 for Minecraft 1.7.10 loading

[16:38:56] [main/INFO] [FML]: Java is Java HotSpot 64-Bit Server VM, version 1.8.0_20, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre1.8.0_20

[16:38:56] [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation

[16:38:56] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[16:38:56] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

[16:38:56] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[16:38:56] [main/ERROR] [LaunchWrapper]: Unable to launch

java.util.ConcurrentModificationException

at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_20]

at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_20]

at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]

at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]

 

 

Whenever i delete the file C:\Program Files\Java\jre1.8.0_20 It won't open eclipse.  This pops up: http://i.imgur.com/vXzDGkT.png

AHA. The issue is that you have Java 8. Definitely make sure that you have a copy of Java 7 installed, as well as the JDK 7 environment. Currently, Minecraft and coder packs don't support Java 8. You might have to spend some time searching for a Java 7 version, but JDK 7 is quite easy to find. Always look at the version before downloading!

Java 8 shouldn't be a problem, since I use it for modding and Minecraft without any errors.

Java 8 is the most common problem beginner modders can't set up their environment.

(that and incompetence)

Use Java 7