Modpack Does Not Launch

[Radar12564]

Okay. So it's been a while since I last played Minecraft at all, so the first thing I did was update java to version 7 update 51 (Or something like that). Before, only Attack of the B-Team wouldn't launch, now none of them do, giving me a popup saying "Error: Could not create the Java virtual machine. Error: A fatal exception has occured. Program will exit." When I close the window, the launcher pops back up. This is on all of the modpacks, however. Anyone had similar issues or any suggestions on a fix?

[Munaus]

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