Ok, i'd like to set it up so people cant reg. w/bogus emails so i set //$closeRegister=1. I also have $genEmailDisable=0 and $emailusers=1. However, it is not doing what it says it will. Upon registering, they still have an option to pick their own password and it does not email them a password. Am I missing something?

Are you familiar with PHP?

//$closeRegister=1

actually means COMMENTED string. Of course, it will not work (and by default, it is not working) - you need to uncomment it:

$closeRegister=1;

omg i knew that and i have no idea why i didn't uncomment.. sorry for wasting you time... lol

i set $closeRegister=1.
I also have $genEmailDisable=0

Yesterday i tried to register the new user, but the letter with the password has not come.
I have to restore the password then only the letter has come.
One month ago all worked..... I do not remember exactly.

Today I have created a mail box admin@mydomain.net
- I have installed it in setup_options.php (before he was myname@rambler.ru)
And all began to work -
I tried to register the new user, letter with the password has come!!!
In what the error can be?
There can be a problem with my Hosting server?

Of course, if it worked earlier, and doesn't work now, the error is on your side, it's not related to miniBB. miniBB script can't change its mind and stop working one day just because it's tired. Most probably it's a hosting issue.

But also it is possible that your email server blocking automated emails coming from your forum. Try to check bulk/spam folders, add your domain to the allowed domains list etc.