Me too is facing the same problem after clicking on payment through my pnb debit card the page suddendly closed n opened the new login page and after loggin into my account again it was showing that payment step is incomplete n also after that i received a message that money has been debited from my bank account. N now also i m trying to login but i can't login n today is tue last date for final registration...what should i do now?

AIIMS hasn't released any resolution till now  for technical errors. S tudents who faced the same issue tried clearing their  cache, browsing history, etc restarting their systems and relogging in. You may try it as well. It might not be resolved immediately but eventually you will be able to get through and complete the registration process.