Technically speaking, you can't really 'disactivate' your MySpace account. It's like saying you delete your MySpace account, but then you want it back. You can't, you wanted it deleted so it's deleted. You probably can't disactivate, but more like delete it you can.
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scroll all the way down to the bottom of your page and click block user. it will ask you if you're sure you want to delete yourself
All that you have to do is log on and then you go to my account and then you press account and then press cancel account and then they ask you why you want to cancel it!!!
This explains step by step how to delete your myspace profile:
http://profilerehab.com/help/delete_myspace_account