This is a computer translation of the error message that you got from QQ:
"Your QQ account number receives registers the limit temporarily! Because your QQ account number existence security risk, the QQ security center begins using registers the limit to protect your QQ safety temporarily. Asks you to relieve the limit immediately through the revision password, after relieving the limit, may use normally. "
So basically you need to reset the password - then you should be ok. I had problems with passwords at one stage and because I had not set up the security questions on my account I could not fix it and ended up having to set up a new account. But since then I have not had any problems. When you do get in I would recommend setting up the security questions so that you have a way to easily fix any problems that you have in the future. I would also suggest using the help on the QQ English site - when I did have my problem they did reply to help me to fix try to fix it - or at least to tell me that what I needed to do.
I am personally very happy with QQ - I mainly use it to communicate with my students and some of the staff at my university. I resisted for a while but I used it last sememster and don't regret my decision at all.