Have an old MBP. Just installed lion on it today. Previously, the computer had no password (at login, I would just hit enter so essentially the password was nothing). After installing Lion, that no longer works, and now I can't get into my computer. Help!

Did i post this question in the right place to get an answer?

Yes.
Have a look at this thread:
https://discussions.apple.com/thread/3189665
It's not uncommon for some people to have a "blank" password, I did that for years. Apparently Lion has a problem with blank passwords.
I hope the procedure in that thread works for you.

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