Generally what that error means is that you entered the wrong password too many times and the site is restricting your access. I would wait 24 hours and try again. If you happen to get into your myspace I suggest changing your email address to your new one ASAP so that you can atleast do a password reset on your account.
Also, if at some point you have done a password reset and you couldn't access your peoplepc email account, I suggest sending an email to MySpace support using this link and describing the situation:
http://collect.myspace.com/index.cfm?fuseaction=misc.contactInput
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