Dear Moderator,thanks for your respose,I am grateful.There is a senior xoops user here taught me that if I upgrade my website xoops2.5 version into xoops2.5.6 then it can be worked.Is it feasible to resolve this kind of problem?

Hi,I am very grateful for xoops.org offering the xoops modules for free,now my website got a problem that my website has been registered by malicious useres sending trash accounts that cause the number of members increased a lot at suddenly.I rent a website host with Linux system for mine to run,and I am using xoops version 2.5(chinese) ,please help me resolve following questions:
1.Do you have appropriate modules of registration form and confirmation code for my webside using?
2.Are there any methods to solve this kind of problems?
I am a beginner of webpage design,please help me,thanks.