Windows .exe Error extracting natives: Unexpected end of ZLIB input stream

[AndrewPwner]

Every time I start a modpack except unleashed this pops up and crashes and yes I gave it more ram.
http://pastebin.com/0B7kpnNQ

 

[lavarthan]

[INFO] JavaFinder.parseWinJavaVersion:137: Java Version: 1.7.0_21 sorted as: 1.7.0_21 32 Bit Java at : C:\Program Files (x86)\Java\jre7\bin\java.exe
[INFO] JavaFinder.parseWinJavaVersion:137: Java Version: 1.6.0_24 sorted as: 1.6.0_24 64 Bit Java at : C:\Program Files\Java\jre6\bin\java.exe
[INFO] JavaFinder.parseWinJavaVersion:137: Java Version: 1.6.0_24 sorted as: 1.6.0_24 64 Bit Java at : C:\Windows\system32\java.exe
[INFO] JavaFinder.parseWinJavaVersion:137: Java Version: 1.7.0_21 sorted as: 1.7.0_21 32 Bit Java at : C:\Windows\SysWOW64\java.exe
[INFO] JavaFinder.parseWinJavaVersion:164: FTB Launcher Prefers: Java Version: 1.6.0_24 sorted as: 1.6.0_24 64 Bit Java at : C:\Program Files\Java\jre6\bin\java.exe

Welcome. You have several versions of Java installed, all very old. Please uninstall all versions of Java and restart your computer. Then install Java 7u51 64bit version only and restart your computer again. If you are still experiencing problems please post a new console log to pastebin.com