How can I delete my account (and posts)?

I'm the same user using a different name...it appears my account was deleted, but none of the posts were...it's not really too big of a deal but I'd still like all of my old posts to be deleted if it's possible (they still show up in old threads and caches of the threads). If an admin or a mod can help me with this please let me know (this probably sounds iffy coming from a different user, but my posts were nothing major so I don't think it should be a problem, and I can provide whatever info needed to prove I'm the same guy...if the account is still active and I just can't get into it, I'd like some help recovering the password so I can delete the posts myself).