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He can't do that with a 32bit os.
@RobotSquid You will need a 64 os and 64 bit java to run the 1.6 & 1.7 packs because they require a minimum of 2gb of ram.
You will need to update the launcher to the beta version because it will not work correctly with java 8. Go to advanced options and put a check mark next to use beta version of the launcher. Now close and relaunch and update it.