Launching Issue

[XxMurdertrampxX]

Having issues with loading any modpacks other than tekkit lite. I've reinstalled technic numerous times and no changes. Ive set the launcher to use 5gb of my 16 gb PC and i'm using java 8 update 45. the two modpacks i've been trying to launch (serendipity unlimited and technolution advanced) just load up and I get "no responding" very rarely do I get a crash report.

Here is a crash report of one of the modpacks: http://pastebin.com/3Uxxzxcp

Here is the technic launcher log: http://pastebin.com/76mgAup1

[XxMurdertrampxX]

Problem solved
For future reference:

An environment variable named "_JAVA_OPTIONS" was set to "-Xmx512M"
Delete it, or change it to a higher value to fix the problem.

[AlphaChubs]

Problem solved
For future reference:

An environment variable named "_JAVA_OPTIONS" was set to "-Xmx512M"
Delete it, or change it to a higher value to fix the problem.

​Where do I find this on my computer?