How to Stop Spam Registration in dolphin website

How to Stop Spam Registration in my dolphin website, i am getting tired deleting them it keeps comming back plz show me a way every second i have 3 to 4 registration it appears that these people are using some kind of software who do i stop this plz suggest

Read these forums, and if you need help contact me :)

http://www.boonex.com/forums/topic/spam-spam-spam-spam-IDEA-.htm

http://www.boonex.com/forums/topic/spam-spam-spam-spam-IDEA-.2.htm

Ask a stupid question that requires input and thought. That has reduced the robots from joining my site.

i want to know how do these people get to know about my dolphin website... 

i got this doubt cause i installed simple machine forum in website and i started immediately getting spam registration

i installed pligg same immediate spam registration.

but when i got an article script made a fresh with programmers i see no spammers registration.

I am just ask not an allegation - Does boonex sell info of all the website using dolpin to spammers for money?

I GOT THE SOLUTION BUY THIS MODULE IT WILL STOP SPAM REGISTRATION  COMPLETELY:
http://www.boonex.com/m/logical-captcha

I HAVE INSTALLED IT 

Recently launched my site, and just a few days after, started to see several spam accounts. 

My solution to the problem was to use the HoneyPot Blacklist Database. Integration with it was easier than I expected. There's already a library that can be use with Dolphin, with just a minor modification.

Library can be downloaded from here 

Instructions on what I did to have it working:

1. Go to Project Honeypot and create an account. Then generate your key
2. Download Zip File. AbyssGuard.zip
3. Create a folder on your main root folder and name it abyssguard
4. Uncompress files into abysguard
5. Download abyssguard.txt
6. Rename abyssguard.txt to abyssguard.php and replace the one in the abyssguard folder with it.
7. Open abyssguard.php and rename all ocurrences of write_log to abyssguard_write_log
8. On join.php and member.php add the following line at the beginning of the file: 
   include ('abyssguard/abyssguard.php');
9. Open the config.php file and add your key on this line:
   $httpblkey = "YOUR KEY HERE";

Hello, 

when I add the code:

 include ('abyssguard/abyssguard.php');

in my join page, 

after I go to the page, I have an error

Fatal error: Cannot redeclare writeLog() (previously declared in /home/gmeazzo/public_html/abyssguard/abyssguard.php:297) in /home/gmeazzo/public_html/inc/utils.inc.php on line 1058

Do you use a different code?