Recently lots of Gmail accounts hacked and to prevent hacking Google offer 2 steps verification. Many of Gmail users followed verification process but after that Gtalk is not working. After 2 steps verification code if you try to singin to Gtalk account it will show Wrong Password error.
Here is the solution of Gtalk Wrong Password Error:
1. Go to account setting: Go to Edit link of 2 Step Verification if you wish to change verification method or backup verification code.
2. To use other apps again go to Account Setting and then click on edit button for Authorising applications & sites. Once you click on the Edit link you will see a Tab
"Step 1 of 2: Generate new application-specific password". Here enter Gtalk and you will receive Password that you need to use in your Gtalk account and it will work as before.
I hope this information help you to access your Gtalk account as before.