[MCL-1215] "java.lang.NullPointerException @ GameLauncher.cleanOldNatives"

I have fixed it now, see bottom of description.

1.5.2 Worked perfectly fine. I've only tried updating to 1.6.2 today and that has crashed my launcher. It says:

java.lang.NullPointerException
	at net.minecraft.launcher.GameLauncher.cleanOldNatives(GameLauncher.java:317)
	at net.minecraft.launcher.GameLauncher.launchGame(GameLauncher.java:167)
	at net.minecraft.launcher.GameLauncher.onDownloadJobFinished(GameLauncher.java:459)
	at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:112)
	at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:10)
	at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:84)
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

And I'm not a Java person so I don't have a clue what that means... In-fact, I'm barely a computer person.

Have tried:
-Running as administrator
-Deleting all files from the '.minecraft' folder and running the Minecraft launcher again
-Changing the game directory using 'Edit Profile'

I've fixed it!
I restarted my computer, deleted everything from the '.minecraft' folder and opened the launcher, logged in and it opened the game perfectly fine!

"java.lang.NullPointerException @ GameLauncher.cleanOldNatives" - Can't login on the new launcher.