Any time I try to launch a modpack, the launcher disappears and then reappears a few seconds later. I've tried both Attack of the B Team and Tekkit Classic. I'm using Windows 10, java 1.8.0_25 and have 3 GB of ram allocated. I tried going back to the latest version of java (1.8.0_101) and still nothing changed. I ran clearJavaEnvVars.bat as recommended on other posts, to no avail.
Console Log: http://pastebin.com/7eNBjwfM